Abstract
Abstract Through a detailed regional study of the Lower Triassic (Nammalian) Sinbad Limestone Member of the Moenkopi Formation in southeastern Utah, previously qualitative paleoecological observations on Early Triassic gastropods have been quantified. Paleocommunities of the Lower Triassic Sinbad Limestone Member are dominated by gastropod juveniles and small-size adult gastropods (99% of the gastropods are smaller than 1 cm) that form numerous microgastropod packstones and grainstones that were deposited subtidally. The results from this case study of the Sinbad Limestone Member reflect a global Early Triassic phenomenon of microgastropod-dominated open-shelf environments. These characteristics of the paleoecology of Early Triassic gastropod faunas are non-actualistic since, during Ecological Evolutionary Units (EEUs), larger gastropods and normal-marine communities are invariably common somewhere contemporaneous with the occurrence of microgastropod-dominated faunas. Early Triassic microgastropods behav...
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