First Sentence:
Fossil snakes appear later in the geological record than any other reptile group.
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Key Phrases - Statistically Improbable Phrases (SIPs):
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hemal keel, subcentral ridges, trunk vertebra, zygosphenal articular facets, round condyle, zygantral articular facets, holotype vertebra, colubrine genera, higher neural spine, vaulted neural arch, neural spine length, other fossil localities, posterior overhang, referred vertebrae, right prezygapophysis, fossil snakes, paratype vertebrae, propeltis triangulum, vomerine process, propeltis getula, centrum length, haemal keel, left postzygapophysis, zygapophyseal articular facets, vertebral form
Key Phrases - Capitalized Phrases (CAPs):
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Late Pleistocene, Early Holocene, North America, New Mexico, South Dakota, Middle Pliocene, Middle Eocene, Identification of Fossil Remains, Late Barstovian, Late Pliocene, Medial Barstovian, Early Oligocene, West Virginia, Early Eocene, Middle Pleistocene, Late Middle, Late Hemphillian, Van Devender, Early Barstovian, Middle Hemphillian, Late Arikareean, Early Arikareean, Late Oligocene, Late Eocene, New Jersey
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