The most common fossils in Lower Triassic rocks are

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Lower Triassic rocks are dated to the beginning of the Triassic period, which followed the mass extinction event at the end of the Permian period. This event drastically reduced the diversity of marine life, including the extinction of trilobites and rugose corals. Mollusks, however, were some of the few groups that survived this extinction and their fossils are common in Lower Triassic rocks. Lacy bryozoans were not as common during this time period.

The Most Common Fossils in Lower Triassic Rocks Are