page_title: 1904 in paleontology
section_title: Non-mammalian
hierarchical_section_title: 1904 in paleontology / Synapsids / Non-mammalian
caption_attribution_description: Placerias hesternus
context_page_description: Paleontology or palaeontology is the study of prehistoric life forms on Earth through the examination of plant and animal fossils. This includes the study of body fossils, tracks, burrows, cast-off parts, fossilised feces, palynomorphs and chemical residues. Because humans have encountered fossils for millennia, paleontology has a long history both before and after becoming formalized as a science.
caption: Placerias
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