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| Mesozoic Marine Revolution | |
|---|---|
| Name | Mesozoic Marine Revolution |
| Period | Mesozoic |
| Era | Mesozoic Era |
| Onset | Triassic |
| Peak | Jurassic–Cretaceous |
| Key figures | Charles Darwin, Alfred Wegener, Edward Drinker Cope, Harry Seeley, Othniel Charles Marsh |
| Regions | Tethys Ocean, Gondwana, Laurasia, Western Interior Seaway |
| Notable taxa | Ammonoidea, Belemnoidea, Bivalvia, Gastropoda, Crustacea, Echinodermata |
Mesozoic Marine Revolution The Mesozoic Marine Revolution describes a prolonged interval of ecological and evolutionary change during the Mesozoic Era when marine predator–prey interactions intensified, producing widespread morphological and behavioral innovations across marine faunas. It transformed shallow marine ecosystems by promoting escalation between durophagous predators and armored or infaunal prey, reshaping community structure from the Triassic through the Cretaceous and influencing Cenozoic lineages.
During the Mesozoic, global plate motions recorded by Alfred Wegener-related reconstructions and subsequent work on continental drift reorganized ocean basins such as the Tethys Ocean and Western Interior Seaway, altering shallow marine habitats and connectivity. Sea-level fluctuations associated with eustatic cycles studied by researchers connected to Georges Cuvier and later stratigraphers produced transgressive-regressive sequences documented in basins like the Burgess Shale-proximal shelves and the Solnhofen lagoons. Volcanism linked to large igneous provinces, examined in contexts including Deccan Traps analogs and Triassic flood basalts, influenced ocean chemistry along with shifts in carbonate platforms like those of Epeiric seas within Laurasia and Gondwana. Paleoclimatic reconstructions drawing on work in regions such as Greenland, Patagonia, and Antarctica provide environmental frameworks for the escalation of marine interactions.
Escalation theory promoted by scholars influenced by ideas from Charles Darwin and later proponents posits that reciprocal selective pressure between predators and prey drives morphological innovation across clades. Increases in metabolic rates inferred from isotopic studies tied to research groups at institutions including Smithsonian Institution and Natural History Museum, London correlate with the rise of active nektonic predators such as cephalopods and marine reptiles investigated by paleontologists like Othniel Charles Marsh and Edward Drinker Cope. Trophic restructuring involved niche expansions documented in faunal lists from Solnhofen, Santana Formation, and Hell Creek Formation outcrops. Biotic interactions amplified by competition among benthic suspension feeders and mobile predators, framed within concepts advanced by scholars at University of Cambridge and University of California, Berkeley, produced cascading ecological effects.
Predators evolved hardened bite structures and armatures, exemplified by the evolution of crushing jaws in some Decapoda lineages and reinforced radulae in Gastropoda groups; comparable innovations were described in the cephalopod family Belemnoidea and in teleost fishes studied in collections at American Museum of Natural History. Prey responses included shell thickening, development of spines and ridges in Bivalvia and Echinoidea, and widespread adoption of infaunal lifestyles among benthos, as seen in assemblages from Chesapeake Bay-equivalent strata. Burrowing behaviors and escape strategies paralleled morphological defenses, with examples from the fossil record curated at Natural History Museum of Los Angeles County and Yale Peabody Museum documenting shifts in life habit.
Bivalves such as heterodonts and pteriomorphs, gastropods including prosobranchs, and cephalopods like Ammonoidea and Belemnoidea demonstrate major turnover; crustacean clades including branching Decapoda and stomatopods diversified in response to new predatory niches. Echinoderms, notably irregular echinoids, and echinoderm-resembling groups show morphological novelties, while vertebrate predators including marine reptiles—e.g., Ichthyosauria, Plesiosauria—and early teleosts radiated concurrently. Many taxa recorded in museum collections such as Field Museum and Muséum national d'Histoire naturelle illustrate compositional changes across the revolution.
Temporal dynamics span from early Triassic recoveries after end-Permian crises through Jurassic-Cretaceous proliferation and culminate before the end-Cretaceous extinction events tied to research on impact hypotheses associated with the Chicxulub crater and contemporaneous volcanic activity. Geographic heterogeneity is evident: shallow epicontinental seas of Laurasia and Gondwana hosted different trajectories compared with open ocean faunas of the Panthalassa realm. Regional case studies from formations in Europe, North America, Australia, and South America expose asynchronous timing and varying intensity of escalation.
Fossil evidence includes drillholes, repair scars, and shell breakage patterns quantified in museum specimen databases and described in monographs from institutions such as Royal Society-affiliated journals. Lagerstätten like Solnhofen and Sannine preserve predator-prey interactions and soft-tissue anatomy enabling behavior inference. Taphonomic biases studied by researchers at University of Chicago and University of Oxford complicate signals; nonetheless, statistically robust increases in durophagy indicators, trace fossils documenting burrowing intensity, and shifts in assemblage evenness across stratigraphic sections provide cumulative support.
The revolution reshaped trophic webs, favoring mobile predators and infaunal or armored prey, ultimately setting the stage for Cenozoic community structures explored by paleobiologists associated with Smithsonian Institution and Natural History Museum, London. Long-term consequences include altered macroevolutionary rates, increased disparity in shell morphologies, and the preconditioning of lineages that later radiated in post-Cretaceous ecosystems examined in studies at University of California, Los Angeles and Princeton University. The phenomenon remains a core example of coevolutionary escalation within macroecology and macroevolution debates advanced across institutions and symposiums such as those convened by the Paleontological Society.
Category:Marine paleontology