Molar tooth structures in the late Mesoproterozoic Victor Bay Formation, Nunavut, Canada. Canadian penny for scale.
Molar tooth structures are ribbon-like veins and nodules of calcite that are found widespread in Precambrian carbonate sedimentary rocks between approximately 2600 to 570 million years ago.[1] Their mechanism for formation remains debated, with hypothesis including the generation of methane gas within sediments,[2][3] pumping of water through sediment by wave action,[1][4] tsunamis,[5] and bacterial processes.[6]
^ abBishop, James W.; Sumner, Dawn Y. (2006). "Molar tooth structures of the Neoarchean Monteville Formation, Transvaal Supergroup, South Africa. I: Constraints on microcrystalline CaCO3 precipitation". Sedimentology. 53 (5): 1049–1068. Bibcode:2006Sedim..53.1049B. doi:10.1111/j.1365-3091.2006.00801.x. ISSN 1365-3091. S2CID 128918962. Archived from the original on 2021-03-19. Retrieved 2021-03-19.
^Furniss, G.; Rittel, J. F.; Winston, D. (1998-01-01). "Gas bubble and expansion crack origin of "molar-tooth" calcite structures in the middle Proterozoic Belt Supergroup, western Montana". Journal of Sedimentary Research. 68 (1): 104–114. Bibcode:1998JSedR..68..104F. doi:10.2110/jsr.68.104. ISSN 1527-1404.
^Bishop, James W.; Sumner, Dawn Y.; Huerta, Nicolas J. (2006). "Molar tooth structures of the Neoarchean Monteville Formation, Transvaal Supergroup, South Africa. II: A wave-induced fluid flow model". Sedimentology. 53 (5): 1069–1082. Bibcode:2006Sedim..53.1069B. doi:10.1111/j.1365-3091.2006.00802.x. ISSN 1365-3091. S2CID 140684887. Archived from the original on 2021-03-19. Retrieved 2021-03-19.
^Pratt, Brian R. (1998-08-01). "Molar-tooth structure in Proterozoic carbonate rocks: Origin from synsedimentary earthquakes, and implications for the nature and evolution of basins and marine sediment". GSA Bulletin. 110 (8): 1028–1045. Bibcode:1998GSAB..110.1028P. doi:10.1130/0016-7606(1998)110<1028:MTSIPC>2.3.CO;2. ISSN 0016-7606. Archived from the original on 2021-03-19. Retrieved 2021-03-19.
^Hodgskiss, Malcolm S. W.; Kunzmann, Marcus; Poirier, André; Halverson, Galen P. (2018-01-15). "The role of microbial iron reduction in the formation of Proterozoic molar tooth structures". Earth and Planetary Science Letters. 482: 1–11. Bibcode:2018E&PSL.482....1H. doi:10.1016/j.epsl.2017.10.037. ISSN 0012-821X. Archived from the original on 2021-03-19. Retrieved 2021-03-19.
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