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Paleontology or palaeontology is the study of prehistoric life forms on Earth through the examination of plant and animal fossils.[1] This includes the study of body fossils, tracks (ichnites), burrows, cast-off parts, fossilised feces (coprolites), 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. This article records significant discoveries and events related to paleontology that occurred or were published in the year 1900.
Sauropterygia
Newly named plesiosaurs
| Name | Novelty | Status | Authors | Age | Unit | Location | Notes | Images | 
|---|---|---|---|---|---|---|---|---|
| 
 Knight  | 
 Sundance Formation, Wyoming  | 
 recombined as Tatenectes laramiensis in 2003  | 
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Synapsids
Non-mammalian
| Name | Novelty | Status | Authors | Age | Unit | Location | Notes | Images | 
|---|---|---|---|---|---|---|---|---|
| 
 Dicranozygoma  | 
 Gen. et sp. nov  | 
 Seeley  | 
 A dicynodont of uncertain position  | 
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| 
 Gen. et sp. nov  | 
 Valid  | 
 Broom  | 
 Late Permian  | 
 A member of Baurioidea.  | 
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