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Stromatolites (/stroʊˈmætəˌlaɪts, strə-/ stroh-MAT-ə-lytes, strə-) or stromatoliths (from Ancient Greek στρῶμα (strôma), GEN στρώματος (strṓmatos) 'layer, stratum' and λίθος (líthos) 'rock') are layered sedimentary formations (microbialite) that are created mainly by photosynthetic microorganisms such as cyanobacteria, sulfate-reducing bacteria, and Pseudomonadota (formerly proteobacteria). These microorganisms produce adhesive compounds that cement sand and other rocky materials to form mineral "microbial mats". In turn, these mats build up layer by layer, growing gradually over time.

This process generates the characteristic lamination of stromatolites, a feature that is hard to interpret, in terms of its temporal and environmental significance. Different styles of stromatolite lamination have been described, which can be studied through microscopic and mathematical methods. A stromatolite may grow to a meter or more. Fossilized stromatolites provide important records of some of the most ancient life. As of the Holocene, living forms are rare.

Morphology

Stromatolites are layered, biochemical, accretionary structures formed in shallow water by the trapping, binding and cementation of sedimentary grains in biofilms (specifically microbial mats), through the action of certain microbial lifeforms, especially cyanobacteria. They exhibit a variety of forms and structures, or morphologies, including conical, stratiform, domal, columnar, and branching types. Stromatolites occur widely in the fossil record of the Precambrian but are rare today. Very few Archean stromatolites contain fossilized microbes, but fossilized microbes are sometimes abundant in Proterozoic stromatolites.

While features of some stromatolites are suggestive of biological activity, others possess features that are more consistent with abiotic (non-biological) precipitation. Finding reliable ways to distinguish between biologically formed and abiotic stromatolites is an active area of research in geology. Multiple morphologies of stromatolites may exist in a single local or geological stratum, depending on specific conditions at the time of their formation, such as water depth.

Most stromatolites are spongiostromate in texture, having no recognisable microstructure or cellular remains. A minority are porostromate, having recognisable microstructure; these are mostly unknown from the Precambrian but persist throughout the Palaeozoic and Mesozoic. Since the Eocene, porostromate stromatolites are known only from freshwater settings.

Formation

Time lapse photography of modern microbial mat formation in a laboratory setting gives some revealing clues to the behavior of cyanobacteria in stromatolites. Biddanda et al. (2015) found that cyanobacteria exposed to localized beams of light moved towards the light, or expressed phototaxis, and increased their photosynthetic yield, which is necessary for survival. In a novel experiment, the scientists projected a school logo onto a petri dish containing the organisms, which accreted beneath the lighted region, forming the logo in bacteria. The authors speculate that such motility allows the cyanobacteria to seek light sources to support the colony.

In both light and dark conditions, the cyanobacteria form clumps that then expand outwards, with individual members remaining connected to the colony via long tendrils. In harsh environments where mechanical forces may tear apart the microbial mats, these substructures may provide evolutionary benefit to the colony, affording it at least some measure of shelter and protection.

Lichen stromatolites are a proposed mechanism of formation of some kinds of layered rock structure that are formed above water, where rock meets air, by repeated colonization of the rock by endolithic lichens.

Fossil record

Some Archean rock formations show macroscopic similarity to modern microbial structures, leading to the inference that these structures represent evidence of ancient life, namely stromatolites. However, others regard these patterns as being the result of natural material deposition or some other abiogenic mechanism. Scientists have argued for a biological origin of stromatolites due to the presence of organic globule clusters within the thin layers of the stromatolites, of aragonite nanocrystals (both features of current stromatolites), and of other microstructures in older stromatolites that parallel those in younger stromatolites that show strong indications of biological origin.

Stromatolites are a major constituent of the fossil record of the first forms of life on Earth. They peaked about 1.25 billion years ago (Ga) and subsequently declined in abundance and diversity, so that by the start of the Cambrian they had fallen to 20% of their peak. The most widely supported explanation is that stromatolite builders fell victim to grazing creatures (the Cambrian substrate revolution); this theory implies that sufficiently complex organisms were common around 1 Ga. Another hypothesis is that protozoa such as foraminifera were responsible for the decline, favoring formation of thrombolites over stromatolites through microscopic bioturbation.

Proterozoic stromatolite microfossils (preserved by permineralization in silica) include cyanobacteria and possibly some forms of the eukaryote chlorophytes (that is, green algae). One genus of stromatolite very common in the geologic record is Collenia.

The connection between grazer and stromatolite abundance is well documented in the younger Ordovician evolutionary radiation; stromatolite abundance also increased after the Late Ordovician mass extinction and Permian–Triassic extinction event decimated marine animals, falling back to earlier levels as marine animals recovered. Fluctuations in metazoan population and diversity may not have been the only factor in the reduction in stromatolite abundance. Factors such as the chemistry of the environment may have been responsible for changes.

While prokaryotic cyanobacteria reproduce asexually through cell division, they were instrumental in priming the environment for the evolutionary development of more complex eukaryotic organisms. They are thought to be largely responsible for increasing the amount of oxygen in the primeval Earth's atmosphere through their continuing photosynthesis (see Great Oxygenation Event). They use water, carbon dioxide, and sunlight to create their food. A layer of polysaccharides often forms over mats of cyanobacterial cells. In modern microbial mats, debris from the surrounding habitat can become trapped within the polysaccharide layer, which can be cemented together by the calcium carbonate to grow thin laminations of limestone. These laminations can accrete over time, resulting in the banded pattern common to stromatolites. The domal morphology of biological stromatolites is the result of the vertical growth necessary for the continued infiltration of sunlight to the organisms for photosynthesis. Layered spherical growth structures termed oncolites are similar to stromatolites and are also known from the fossil record. Thrombolites are poorly laminated or non-laminated clotted structures formed by cyanobacteria, common in the fossil record and in modern sediments. There is evidence that thrombolites form in preference to stromatolites when foraminifera are part of the biological community.

The Zebra River Canyon area of the Kubis platform in the deeply dissected Zaris Mountains of southwestern Namibia provides a well-exposed example of the thrombolite-stromatolite-metazoan reefs that developed during the Proterozoic period, the stromatolites here being better developed in updip locations under conditions of higher current velocities and greater sediment influx.

Modern occurrence

Saline locations

Modern stromatolites are mostly found in hypersaline lakes and marine lagoons where high saline levels prevent animal grazing. One such location where excellent modern specimens can be observed is Hamelin Pool Marine Nature Reserve, Shark Bay in Western Australia. In 2010, a fifth type of chlorophyll, namely chlorophyll f, was discovered by Min Chen from stromatolites in Shark Bay. Halococcus hamelinensis, a halophilic archaeon, occurs in living stromatolites in Shark Bay where it is exposed to extreme conditions of UV radiation, salinity and desiccation. H. hamelinesis possesses genes that encode enzymes employed in the repair of UV induced damages in DNA by the processes of nucleotide excision repair and photoreactivation.

Other locations include Pampa del Tamarugal National Reserve in Chile; Lagoa Salgada, Rio Grande do Norte, Brazil, where modern stromatolites can be observed as both bioherms (domal type) and beds; and in the Puna de Atacama of the Andes.

Inland stromatolites can be found in saline waters in Cuatro Ciénegas Basin, a unique ecosystem in the Mexican desert. Alchichica Lake in Puebla, Mexico has two distinct morphologic generations of stromatolites: columnar-dome like structures, rich in aragonite, forming near the shore line, dated back to 1,100 years before present (ybp) and spongy-cauliflower like thrombolytic structures that dominate the lake from top to the bottom, mainly composed of hydromagnesite, huntite, calcite and dated back to 2,800 ybp. The only open marine environment where modern stromatolites are known to prosper is the Exuma Cays in the Bahamas.

Freshwater locations

Laguna de Bacalar in Mexico's southern Yucatán Peninsula has an extensive formation of living giant microbialites (that is, stromatolites or thrombolites). The microbialite bed is over 10 km (6.2 mi) long with a vertical rise of several meters in some areas. These may be the largest sized living freshwater microbialites, or any organism, on Earth.

A 1.5 km stretch of reef-forming stromatolites (primarily of the genus Scytonema) occurs in Chetumal Bay in Belize, just south of the mouth of the Rio Hondo and the Mexican border. Large microbialite towers up to 40 m high were discovered in the largest soda lake on Earth Lake Van in eastern Turkey. They are composed of aragonite and grow by precipitation of calcite from sub-lacustrine karst-water. Freshwater stromatolites are found in Lake Salda in southern Turkey. The waters are rich in magnesium and the stromatolite structures are made of hydromagnesite.

Two instances of freshwater stromatolites are found in Canada, at Pavilion Lake and Kelly Lake in British Columbia. Pavilion Lake has the largest known freshwater stromatolites, and NASA has conducted xenobiology research there, called the "Pavilion Lake Research Project." The goal of the project is to better understand what conditions would likely harbor life on other planets.

Microbialites have been discovered in an open pit pond at an abandoned asbestos mine near Clinton Creek, Yukon, Canada. These microbialites are extremely young and presumably began forming soon after the mine closed in 1978. The combination of a low sedimentation rate, high calcification rate, and low microbial growth rate appears to result in the formation of these microbialites. Microbialites at an historic mine site demonstrates that an anthropogenically constructed environment can foster microbial carbonate formation. This has implications for creating artificial environments for building modern microbialites including stromatolites.

A very rare type of non-lake dwelling stromatolite lives in the Nettle Cave at Jenolan Caves, NSW, Australia. The cyanobacteria live on the surface of the limestone and are sustained by the calcium-rich dripping water, which allows them to grow toward the two open ends of the cave which provide light.

Stromatolites composed of calcite have been found in both the Blue Lake in the dormant volcano, Mount Gambier and at least eight cenote lakes including the Little Blue Lake in the Lower South-East of South Australia.

See also

• Banded iron formation
• Cotham Marble
• Gunflint Range
• Laguna Negra, Catamarca
• Microbially induced sedimentary structure
• Ojos de Mar
• Thrombolites

References

1. Duda, J-P.; Van Kranendonk, M.J.; Thiel, V.; Ionescu, D.; Strauss, H.; Schäfer, N.; Reitner, J. (2016). "A Rare Glimpse of Paleoarchean Life: Geobiology of an Exceptionally Preserved Microbial Mat Facies from the 3.4 Ga Strelley Pool Formation, Western Australia". PLOS One. 11 (1): e0147629. Bibcode:2016PLoSO..1147629D. doi:10.1371/journal.pone.0147629. PMC 4726515. PMID 26807732.
2. "stromatolite". Merriam-Webster.com Dictionary. Merriam-Webster. Retrieved 21 January 2016.
3. "stromatolite". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 17 June 2020.
4. στρῶμα, λίθος. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project.
5. Winner, Cherie (15 November 2013). "What Doomed the Stromatolites?". Woods Hole Oceanographic Institution.
6. "Two-ton, 500 Million-year-old Fossil Of Stromatolite Discovered In Virginia, U.S." 8 July 2008.
7. Seong-Joo, Lee; Browne, Kathleen M.; Golubic, Stjepko (2000), Riding, Robert E.; Awramik, Stanley M. (eds.), "On Stromatolite Lamination", Microbial Sediments, Berlin, Heidelberg: Springer Berlin Heidelberg, pp. 16–24, doi:10.1007/978-3-662-04036-2_3, ISBN 978-3-642-08275-7, retrieved 9 February 2024
8. Arenas, Concha; Jones, Brian (October 2017). Hollis, Cathy (ed.). "Temporal and environmental significance of microbial lamination: Insights from Recent fluvial stromatolites in the River Piedra, Spain". Sedimentology. 64 (6): 1597–1629. doi:10.1111/sed.12365. ISSN 0037-0746.
9. Monty, C.L.V. (1976), "Chapter 5.1 The Origin and Development of Cryptalgal Fabrics", Developments in Sedimentology, vol. 20, Elsevier, pp. 193–249, doi:10.1016/s0070-4571(08)71137-3, ISBN 978-0-444-41376-5, retrieved 9 February 2024
10. ^ Suarez-Gonzalez, Pablo; Quijada, I. Emma; Benito, M. Isabel; Mas, Ramón; Merinero, Raúl; Riding, Robert (March 2014). "Origin and significance of lamination in Lower Cretaceous stromatolites and proposal for a quantitative approach". Sedimentary Geology. 300: 11–27. doi:10.1016/j.sedgeo.2013.11.003.
11. "Stromatolites". Indiana University Bloomington. Archived from the original on 19 March 2018. Retrieved 14 May 2018.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
12. ^ Riding, R. (2007). "The term stromatolite: towards an essential definition". Lethaia. 32 (4): 321–30. doi:10.1111/j.1502-3931.1999.tb00550.x. Archived from the original on 2 May 2015.
13. Zhu, Dongya; Liu, Quanyou; Wang, Jingbin; Ding, Qian; He, Zhiliang (July 2021). "Stable carbon and oxygen isotope data of Late Ediacaran stromatolites from a hypersaline environment in the Tarim Basin (NW China) and their reservoir potential". Facies. 67 (3): 25. doi:10.1007/s10347-021-00633-0. S2CID 235638690.
14. Planavsky, Noah; Grey, Kathleen (16 August 2007). "Stromatolite branching in the Neoproterozoic of the Centralian Superbasin, Australia: an investigation into sedimentary and microbial control of stromatolite morphology". Geobiology. 6 (1): 070816220552001––. doi:10.1111/j.1472-4669.2007.00116.x. PMID 18380884. S2CID 5495943.
15. ^ Peters, Shanan E.; Husson, Jon M.; Wilcots, Julia (June 2017). "The rise and fall of stromatolites in shallow marine environments" (PDF). Geology. 45 (6): 487–490. Bibcode:2017Geo....45..487P. doi:10.1130/G38931.1.
16. Lepot, Kevin (October 2020). "Signatures of early microbial life from the Archean (4 to 2.5 Ga) eon". Earth-Science Reviews. 209: 103296. Bibcode:2020ESRv..20903296L. doi:10.1016/j.earscirev.2020.103296. hdl:20.500.12210/62415. S2CID 225413847.
17. Grotzinger, John P.; Rothman, Daniel H. (3 October 1996). "An abiotic model for stromatolite morphogenesis". Nature. 383 (6599): 423–425. Bibcode:1996Natur.383..423G. doi:10.1038/383423a0. S2CID 4325802.
18. ^ Lepot, Kevin; Karim Benzerara; Gordon E. Brown; Pascal Philippot (2008). "Microbially influenced formation of 2.7 billion-year-old stromatolites". Nature Geoscience. 1 (2): 118–21. Bibcode:2008NatGe...1..118L. doi:10.1038/ngeo107.
19. Perri, E.; Tucker, M. E.; Mawson, M. (25 September 2013). "Biotic and Abiotic Processes In the Formation and Diagenesis of Permian Dolomitic Stromatolites (Zechstein Group, NE England)". Journal of Sedimentary Research. 83 (10): 896–914. Bibcode:2013JSedR..83..896P. doi:10.2110/jsr.2013.65. Retrieved 8 January 2022.
20. Meilijson, Aaron; Bialik, Or M.; Benjamini, Chaim (December 2015). "Stromatolitic biotic systems in the mid-Triassic of Israel — A product of stress on an epicontinental margin". Palaeogeography, Palaeoclimatology, Palaeoecology. 440: 696–711. Bibcode:2015PPP...440..696M. doi:10.1016/j.palaeo.2015.09.030.
21. Monty, C. L. (1981). Monty, Claude (ed.). "Spongiostromate vs. Porostromate Stromatolites and Oncolites". Phanerozoic Stromatolites. Berlin, Heidelberg: Springer: 1–4. doi:10.1007/978-3-642-67913-1_1. ISBN 978-3-642-67913-1.
22. ^ Biddanda, Bopaiah A.; McMillan, Adam C.; Long, Stephen A.; Snider, Michael J.; Weinke, Anthony D. (1 January 2015). "Seeking sunlight: rapid phototactic motility of filamentous mat-forming cyanobacteria optimize photosynthesis and enhance carbon burial in Lake Huron's submerged sinkholes". Frontiers in Microbiology. 6: 930. doi:10.3389/fmicb.2015.00930. PMC 4561352. PMID 26441867.
23. Lichen Stromatolites: Criterion for Subaerial Exposure and a Mechanism for the Formation of Laminar Calcretes (Caliche), Colin F. Klappa, Journal of Sedimentary Petrology, Vol. 49 (1979) No. 2. (June), Pages 387–400, Archived 28 October 2014 at the Wayback Machine
24. Paleobotany: The Biology and Evolution of Fossil Plants, Edith L. Taylor, Thomas N. Taylor, Michael Krings, page Archived 28 October 2014 at the Wayback Machine
25. ^ Allwood, Abigail; Grotzinger; Knoll; Burch; Anderson; Coleman; Kanik (2009). "Controls on development and diversity of Early Archean stromatolites". Proceedings of the National Academy of Sciences. 106 (24): 9548–9555. Bibcode:2009PNAS..106.9548A. doi:10.1073/pnas.0903323106. PMC 2700989. PMID 19515817.
26. Cradle of life: the discovery of earth's earliest fossils. Princeton, N.J: Princeton University Press. 1999. pp. 87–89. ISBN 978-0-691-08864-8.
27. ^ Garwood, Russell J. (2012). "Patterns in Palaeontology: The first 3 billion years of evolution". Palaeontology Online. 2 (11): 1–14. Archived from the original on 26 June 2015. Retrieved 25 June 2015.
28. McMenamin, M. A. S. (1982). "Precambrian conical stromatolites from California and Sonora". Bulletin of the Southern California Paleontological Society. 14 (9&10): 103–105.
29. McNamara, K.J. (20 December 1996). "Dating the Origin of Animals". Science. 274 (5295): 1993–1997. Bibcode:1996Sci...274.1993M. doi:10.1126/science.274.5295.1993f.
30. Awramik, S.M. (19 November 1971). "Precambrian columnar stromatolite diversity: Reflection of metazoan appearance". Science. 174 (4011): 825–827. Bibcode:1971Sci...174..825A. doi:10.1126/science.174.4011.825. PMID 17759393. S2CID 2302113.
31. Bengtson, S. (2002). "Origins and early evolution of predation" (PDF). In Kowalewski, M.; Kelley, P.H. (eds.). The fossil record of predation. The Paleontological Society Papers. Vol. 8. The Paleontological Society. pp. 289–317. Retrieved 29 December 2014.
32. Bernhard, J. M.; Edgcomb, V. P.; Visscher, P. T.; McIntyre-Wressnig, A.; Summons, R. E.; Bouxsein, M. L.; Louis, L.; Jeglinski, M. (28 May 2013). "Insights into foraminiferal influences on microfabrics of microbialites at Highborne Cay, Bahamas". Proceedings of the National Academy of Sciences. 110 (24): 9830–9834. Bibcode:2013PNAS..110.9830B. doi:10.1073/pnas.1221721110. PMC 3683713. PMID 23716649.
33. Sheehan, P.M.; Harris, M.T. (2004). "Microbialite resurgence after the Late Ordovician extinction". Nature. 430 (6995): 75–78. Bibcode:2004Natur.430...75S. doi:10.1038/nature02654. PMID 15229600. S2CID 4423149.
34. Riding, R. (March 2006). "Microbial carbonate abundance compared with fluctuations in metazoan diversity over geological time" (PDF). Sedimentary Geology. 185 (3–4): 229–38. Bibcode:2006SedG..185..229R. doi:10.1016/j.sedgeo.2005.12.015. Archived (PDF) from the original on 26 April 2012. Retrieved 9 December 2011.
35. Kawaguchi, Tomohiro; Decho, Alan W. (January 2000). "Biochemical Characterization of Cyanobacterial Extracellular Polymers (EPS) from Modern Marine Stromatolites (Bahamas)". Preparative Biochemistry and Biotechnology. 30 (4): 321–330. doi:10.1080/10826060008544971. PMID 11065277. S2CID 37979265.
36. Nuwer, Rachel (30 May 2013). "What Happened to the Stromatolites, the Most Ancient Visible Lifeforms on Earth?". Smithsonian Magazine. Smithsonian Institution. Retrieved 18 April 2020.
37. Adams, E. W.; Grotzinger, J. P.; Watters, W. A.; Schröder, S.; McCormick, D. S.; Al-Siyabi, H. A. (2005). "Digital characterization of thrombolite-stromatolite reef distribution in a carbonate ramp system (terminal Proterozoic, Nama Group, Namibia)" (PDF). AAPG Bulletin. 89 (10): 1293–1318. doi:10.1306/06160505005. Archived (PDF) from the original on 7 March 2016. Retrieved 9 December 2011.
38. "Stromatolite | geology".
39. "Oldest evidence of life on Earth found in Australia". The Economic Times.
40. Chen, M. .; Schliep, M. .; Willows, R. D.; Cai, Z. -L.; Neilan, B. A.; Scheer, H. . (2010). "A Red-Shifted Chlorophyll". Science. 329 (5997): 1318–1319. Bibcode:2010Sci...329.1318C. doi:10.1126/science.1191127. PMID 20724585. S2CID 206527174.
41. ^ Leuko S, Neilan BA, Burns BP, Walter MR, Rothschild LJ. Molecular assessment of UVC radiation-induced DNA damage repair in the stromatolitic halophilic archaeon, Halococcus hamelinensis. J Photochem Photobiol B. 2011 Feb 7;102(2):140-5. doi: 10.1016/j.jphotobiol.2010.10.002. Epub 2010 Oct 23. PMID: 21074452
42. Strain, Daniel (6 December 2023). "Deep within an inhospitable desert, a window to first life on Earth". University of Colorado. Archived from the original on 30 December 2023. Retrieved 30 December 2023.
43. Kaźmierczak, J.; Kempe, S.; Kremer, B.; López-Garcia, P.; Moreira, D. & Tavera, R. (2011). "Hydrochemistry and microbialites of the alkaline caldera Lake Alchichica, Mexico". Facies. 57: 543–570. doi:10.1007/s10347-010-0255-8.
44. "217-Stromatolites-Lee-Stocking-Exumas-Bahamas Bahamas". Archived from the original on 26 March 2010. Retrieved 8 December 2011.
45. Feldmann M, McKenzie JA (April 1998). "Stromatolite-thrombolite associations in a modern environment, Lee Stocking Island, Bahamas". PALAIOS. 13 (2): 201–212. Bibcode:1998Palai..13..201F. doi:10.2307/3515490. JSTOR 3515490.
46. Gischler, E.; Gibson, M. & Oschmann, W. (2008). "Giant Holocene Freshwater Microbialites, Laguna Bacalar, Quintana Roo, Mexico". Sedimentology. 55 (5): 1293–1309. Bibcode:2008Sedim..55.1293G. doi:10.1111/j.1365-3091.2007.00946.x. S2CID 129828647.
47. Rasmussen, K.A.; Macintyre, I.G. & Prufert, L (March 1993). "Modern stromatolite reefs fringing a brackish coastline, Chetumal Bay, Belize" (PDF). Geology. 21 (3): 199–202. Bibcode:1993Geo....21..199R. doi:10.1130/0091-7613(1993)021<0199:MSRFAB>2.3.CO;2.
48. Kempe, S.; Kaźmierczak, J.; Landmann, G.; Konuk, T.; Reimer, A. & Lipp, A. (1991). "Largest known microbialites discovered in Lake Van, Turkey". Nature. 349 (6310): 605–608. Bibcode:1991Natur.349..605K. doi:10.1038/349605a0. S2CID 4240438.
49. Braithwaite, C. & Zedef V (November 1996). "Living hydromagnesite stromatolites from Turkey". Sedimentary Geology. 106 (3–4): 309. Bibcode:1996SedG..106..309B. doi:10.1016/S0037-0738(96)00073-5.
50. Ferris FG, Thompson JB, Beveridge TJ (June 1997). "Modern Freshwater Microbialites from Kelly Lake, British Columbia, Canada". PALAIOS. 12 (3): 213–219. Bibcode:1997Palai..12..213F. doi:10.2307/3515423. JSTOR 3515423.
51. Brady, A.; Slater, G.F.; Omelon, C.R.; Southam, G.; Druschel, G.; Andersen, A.; Hawes, I.; Laval, B.; Lim, D.S.S. (2010). "Photosynthetic isotope biosignatures in laminated micro-stromatolitic and non-laminated nodules associated with modern, freshwater microbialites in Pavilion Lake, B.C". Chemical Geology. 274 (1–2): 56–67. Bibcode:2010ChGeo.274...56B. doi:10.1016/j.chemgeo.2010.03.016.
52. "NASA Help NASA Find Life on Mars With MAPPER". NASA. Archived from the original on 30 September 2011. Retrieved 10 December 2011.
53. Power, I.M., Wilson, S.A., Dipple, G.M., and Southam, G. (2011) Modern carbonate microbialites from an asbestos open pit pond, Yukon, Canada, http://onlinelibrary.wiley.com/doi/10.1111/gbi.2011.9.issue-2/issuetoc Archived 11 February 2012 at the Wayback Machine Geobiology. 9: 180–195.
54. Jenolan Caves Reserve Trust. "Nettle Cave Self-guided tour". Archived from the original on 10 September 2011. Retrieved 22 May 2011.
55. Cox G, James JM, Leggett KEA, Osborne RAL (1989). "Cyanobacterially deposited speleothems: Subaerial stromatolites". Geomicrobiology Journal. 7 (4): 245–252. doi:10.1080/01490458909377870.
56. Thurgate, Mia E. (1996). "The Stromatolites of the Cenote Lakes of the Lower South East of South Australia" (PDF). Helictite, Journal of Australasian Cave Research. 34 (1): 17. ISSN 0017-9973. Archived (PDF) from the original on 5 February 2014. Retrieved 14 March 2014.

Further reading

• Grotzinger, John P.; Andrew H. Knoll (1999). "Stromatolites in Precambrian Carbonates: Evolutionary Mileposts or Environmental Dipsticks?". Annual Review of Earth and Planetary Sciences. 27: 313–58. Bibcode:1999AREPS..27..313G. doi:10.1146/annurev.earth.27.1.313. PMID 11543060.
• Allwood, Abigail C.; Malcolm R. Walter; Balz S. Kamber; Craig P. Marshall; Ian W. Burch (2006). "Stromatolite reef from the Early Archaean era of Australia". Nature. 441 (7094): 714–8. Bibcode:2006Natur.441..714A. doi:10.1038/nature04764. PMID 16760969. S2CID 4417746.
• Awramik, S.; Sprinkle, J. (1999). "Proterozoic stromatolites: the first marine evolutionary biota". Historical Biology. 13 (4): 241–253. doi:10.1080/08912969909386584.
• Farías, María E.; Rascovan, Nicolás; Toneatti, Diego M.; Albarracín, Virginia H.; Flores, María R.; Poiré, Daniel Gustavo; Collavino, Mónica Mariana; Aguilar, O. Mario; Vázquez, Martín; Polerecky, Lubos (2013). "The discovery of Stromatolites developing at 3570 m above sea level in a high-altitude volcanic lake Socompa, Argentinean Andes". PLOS ONE. 8 (1): 15. Bibcode:2013PLoSO...853497F. doi:10.1371/journal.pone.0053497. ISSN 1932-6203. PMC 3538587. PMID 23308236. Retrieved 14 April 2014.

External links

• "Stromatolites – Pilbara". Archived from the original on 24 January 2012. Retrieved 10 December 2011.
• "Research Initiatives in Bahamian Stromatolites". Retrieved 10 December 2011.
• "Laguna Bacalar Institute". Archived from the original on 12 January 2012. Retrieved 10 December 2011.
• Stromatolite photo gallery, a teaching set from Ohio State University

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Cenozoic Era (present–66.0 Ma)	Quaternary (present–2.58 Ma) Holocene (present–11.7 ka) Pleistocene (11.7 ka–2.58 Ma) Neogene (2.58–23.0 Ma) Pliocene (2.59–5.33 Ma) Miocene (5.33–23.0 Ma) Paleogene (23.0–66.0 Ma) Oligocene (23.0–33.9 Ma) Eocene (33.9–56.0 Ma) Paleocene (56.0–66.0 Ma)
Mesozoic Era (66.0–252 Ma)	Cretaceous (66.0–145 Ma) Late (66.0–100 Ma) Early (100–145 Ma) Jurassic (145–201 Ma) Late (145–164 Ma) Middle (164–174 Ma) Early (174–201 Ma) Triassic (201–252 Ma) Late (201–237 Ma) Middle (237–247 Ma) Early (247–252 Ma)
Paleozoic Era (252–539 Ma)	Permian (252–299 Ma) Lopingian (252–260 Ma) Guadalupian (260–272 Ma) Cisuralian (272–299 Ma) Carboniferous (299–359 Ma) Pennsylvanian (299–323 Ma) Mississippian (323–359 Ma) Devonian (359–419 Ma) Late (359–383 Ma) Middle (383–393 Ma) Early (393–419 Ma) Silurian (419–444 Ma) Pridoli (419–423 Ma) Ludlow (423–427 Ma) Wenlock (427–433 Ma) Llandovery (433–444 Ma) Ordovician (444–485 Ma) Late (444–458 Ma) Middle (458–470 Ma) Early (470–485 Ma) Cambrian (485–539 Ma) Furongian (485–497 Ma) Miaolingian (497–509 Ma) Series 2 (509–521 Ma) Terreneuvian (521–539 Ma)
Proterozoic Eon (539 Ma–2.5 Ga)	Neoproterozoic (539 Ma–1 Ga) Ediacaran (539–635 Ma) Cryogenian (635–720 Ma) Tonian (720 Ma–1 Ga) Mesoproterozoic (1–1.6 Ga) Stenian (1–1.2 Ga) Ectasian (1.2–1.4 Ga) Calymmian (1.4–1.6 Ga) Paleoproterozoic (1.6–2.5 Ga) Statherian (1.6–1.8 Ga) Orosirian (1.8–2.05 Ga) Rhyacian (2.05–2.3 Ga) Siderian (2.3–2.5 Ga)
Archean Eon (2.5–4 Ga)	Neoarchean (2.5–2.8 Ga) Mesoarchean (2.8–3.2 Ga) Paleoarchean (3.2–3.6 Ga) Eoarchean (3.6–4 Ga)
Hadean Eon (4–4.6 Ga)
ka = kiloannum (thousand years ago); Ma = megaannum (million years ago); Ga = gigaannum (billion years ago). See also: Geologic time scale  • Geology portal  • World portal

v t e Plankton
About plankton	Algal bloom CLAW hypothesis High lipid content microalgae Holoplankton Marine microorganisms Meroplankton Mycoplankton Milky seas effect Paradox of the plankton Planktivore Planktology Red tide Spring bloom Thin layers More...
By size	Eukaryotic picoplankton Heterotrophic picoplankton Marine microplankton Microphyte (microalgae) Nanophytoplankton Photosynthetic picoplankton Picobiliphyte Picoeukaryote Picoplankton
Bacterioplankton	Aeromonas salmonicida Cyanobacteria Cyanobiont Cyanotoxin Enteric redmouth disease Flavobacterium Flavobacterium columnare Pelagibacter ubique Marine bacteriophage SAR11 clade Streptococcus iniae
Phytoplankton	Auxospore Axodine Bacteriastrum Chaetoceros Chaetocerotaceae Coccolithophore Emiliania huxleyi Eustigmatophyte Frustule Stramenopile Nannochloropsis Navicula Prasinophyceae Raphidophyte Thalassiosira pseudonana Diatom orders Centrales Pennales Classes: Coscinodiscophyceae Fragilariophyceae Bacillariophyceae
Flagellates	Brevetoxin Choanoflagellates Dinoflagellates Flagellum Pfiesteria piscicida Saxitoxin Symbiodinium Velvet (fish disease)
Zooplankton	Chaetognatha Ciguatera Ctenophora Gelatinous zooplankton Ichthyoplankton Jellyfish Marine larvae Crustacean larvae Salmon louse Sea louse Copepod orders Calanoida Canuelloida Cyclopoida Gelyelloida Harpacticoida Misophrioida Monstrilloida Mormonilloida Platycopioida Siphonostomatoida More...
Related topics	Aeroplankton Algaculture Algal mat Algal nutrient solutions Artificial seawater Autotrophs Biological pump Diel vertical migration Dimethylsulfoniopropionate f-ratio Fish diseases and parasites Heterotroph HNLC Macroalgae Manta trawl Marine mucilage Microbial mat Ocean acidification Marine microorganisms Marine primary production Pseudoplankton Stromatolite Tychoplankton Zoid C-MORE CPR AusCPR MOCNESS SCAR

• Stromatolites
• Trace fossils
• Cyanobacteria
• Sedimentary rocks