monjungle Dinosaurs Archive

Table 1

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Biostratigraphy of the Smoky Hill Chalk (adapted from Hattin, 1982; Stewart, 1990; Everhart,

2001). Time (MYA = Millions of Years Ago) and boundaries as indicated by Hattin's (1982) marker units (MU) are approximate. The Smoky Hill Chalk Member of the Niobrara Chalk was deposited between 87 and 82 million years ago. Note that the Late Coniacian is unequally divided into two zones: a lower zone (P. pemiciosa) from the base of the chalk to about MU 5 and a brief

upper zone (Spinaptycbus n. sp).