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Was the Early Miocene a second "golden age" for the Chondrichthyans
Joseph Fossil posted a topic in General Fossil Discussion
I recall not too long ago there was a pretty interesting scientific article published in the Journal Science describing how scientists analyzed the amount and diversity of chondrichthyan denticles in ichthyoliths from the North and South Pacific dating from around 20-19 million years ago and discovered a sharp drop in the number and diversity of denticles around 19 million years ago, indicating a massive extinction took place which took sharks 2 to 5 million years to somewhat recover from (it's still unknown if this impacted chondrichthyans worldwide or just in the pacific). Here's the paper: https://www.science.org/doi/10.1126/science.aaz3549 E. C. Sibert, L. D. Rubin, An early Miocene extinction in pelagic sharks. Science 372, 1105–1107 (2021). But after reading it, I remembered how the Mississippian and somewhat Pennsylvanian periods of the Carboniferous era have been called the golden age of sharks due to the sheer diversity of chondrichthyan genera alive at that time. http://www.elasmo-research.org/education/evolution/golden_age.htm What I'm wondering is does this paper, in revealing this early miocene extinction event, inadvertently also reveal that the period immediately prior to the event was a second "golden age" for the chondrichthyans?- 19 replies
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From the album: Shark teeth
This 4.56" cream colored megladon come from the South Pacific area near an Island called New Caledonia.-
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Leap onto land saves fish from being eaten University of New South Wales, March 14, 2017 https://www.sciencedaily.com/releases/2017/03/170314111116.htm "Fish on the South Pacific island of Rarotonga have evolved the ability to survive out of water and leap about on the rocky shoreline..." The paper is: Ord, T.J., Summers, T.C., Noble, M.M. and Fulton, C.J., 2017. Ecological Release from Aquatic Predation Is Associated with the Emergence of Marine Blenny Fishes onto Land. The American Naturalist, 189(5), pp.000-000. Abstract: http://www.journals.uchicago.edu/doi/abs/10.1086/691155 PDF file: http://www.eerc.unsw.edu.au/ord/ord_etal2017.pdf Yours, Paul H.