Invertebrate paleontology is the study of fossilized remains and traces of animals without backbones—a group that constitutes roughly 97% of all animal species. Because invertebrates are so diverse and widespread, their fossils serve as the primary tools for dating rock layers, reconstructing ancient environments, and tracing the evolutionary history of life on Earth. Key Concepts in Fossil Study
: Not all fossils are body parts. Trace fossils—such as burrows, tracks, and trails—provide direct evidence of ancient behavior and environmental conditions, like oxygen levels or water energy. Major Invertebrate Fossil Groups
Understanding fossils begins with the processes that transform a living organism into a geological specimen.
Understanding Fossils: An Introduction to Invertebrate Paleontology
: For an invertebrate to be well-preserved, it typically requires hard parts (like shells or exoskeletons) and rapid burial to protect it from scavengers and decomposition.
: Taphonomy is the study of the transition of organisms from the biosphere to the lithosphere. This process includes death, decay, burial, and subsequent chemical changes known as diagenesis.
The fossil record is dominated by several key groups that are widely used in research and education. Centipedes