Fossil Sorting Guide

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This Fossil Sorting Guide is part of a classroom fossil identification set and provides illustrations and brief descriptions of common fossils, along with their geologic age, classification, and modern relatives. Here’s a summary of what’s included:

This may contain: the classroom set includes four different types of seashells, including one for each class

ðŸĶī Fossils and Details

Fossil Age / Period Classification Modern Relatives
Ammonite Jurassic (146–200 MYA) Class: Cephalopod Squid, snails
Brachiopod Cretaceous (65–146 MYA) Phylum: Brachiopod Some species still exist
Crinoid Stem Devonian (359–416 MYA) Phylum: Echinoderm Starfish, sea urchins, sea cucumbers
Branch Coral Devonian (359–416 MYA) Class: Anthozoa Many coral species still exist
Orthoceras Devonian (359–416 MYA) Class: Cephalopod Squid
Gastropod Cretaceous (65–146 MYA) Phylum: Mollusk Slugs, snails
Trilobite Devonian (359–416 MYA) Phylum: Arthropod Crabs, spiders, insects
Fossil Clam Cretaceous (65–146 MYA) Class: Bivalve Many types of clams still exist
Fossil Snail Class: Gastropod Many types of snails still exist

📊 Timeline

  • The bottom of the page features a timeline marking key periods:

    • Devonian (416–359 MYA)

    • Carboniferous, Permian, Triassic, Jurassic, Cretaceous

  • Highlights transitions between the Paleozoic and Mesozoic Eras

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Categories: Fossil, Home