Platyscaphites, a new ammonite from the Lower Campanian (Upper Cretaceous) of the United States Western Interior
A diminutive genus of scaphite, Platyscaphites gen. nov., probably arose from the Scaphites hippocrepis (DeKay, 1828) stock during early Campanian time in the northern part of the United States Western Interior. Three species, all new, are described; they reveal a trend towards progressive size redu...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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1999
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| _version_ | 1797102289474813952 |
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| author | Cobban, W Kennedy, W Landman, N |
| author_facet | Cobban, W Kennedy, W Landman, N |
| author_sort | Cobban, W |
| collection | OXFORD |
| description | A diminutive genus of scaphite, Platyscaphites gen. nov., probably arose from the Scaphites hippocrepis (DeKay, 1828) stock during early Campanian time in the northern part of the United States Western Interior. Three species, all new, are described; they reveal a trend towards progressive size reduction and recoiling to a planispiral shell morphology, accompanied by a possible reduction in adult size. Platyscaphites groatensis sp. nov., the oldest species, occurs low in the zone of Baculites sp. (smooth), and P. elginensis sp. nov., occurs high in that zone; P. fremontensis sp. nov., is found in the succeeding zone of Baculites sp. (weak flank ribs). |
| first_indexed | 2024-03-07T06:03:51Z |
| format | Journal article |
| id | oxford-uuid:ed25b249-bfb9-4748-a19e-788fe5335a39 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:03:51Z |
| publishDate | 1999 |
| record_format | dspace |
| spelling | oxford-uuid:ed25b249-bfb9-4748-a19e-788fe5335a392022-03-27T11:22:48ZPlatyscaphites, a new ammonite from the Lower Campanian (Upper Cretaceous) of the United States Western InteriorJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ed25b249-bfb9-4748-a19e-788fe5335a39EnglishSymplectic Elements at Oxford1999Cobban, WKennedy, WLandman, NA diminutive genus of scaphite, Platyscaphites gen. nov., probably arose from the Scaphites hippocrepis (DeKay, 1828) stock during early Campanian time in the northern part of the United States Western Interior. Three species, all new, are described; they reveal a trend towards progressive size reduction and recoiling to a planispiral shell morphology, accompanied by a possible reduction in adult size. Platyscaphites groatensis sp. nov., the oldest species, occurs low in the zone of Baculites sp. (smooth), and P. elginensis sp. nov., occurs high in that zone; P. fremontensis sp. nov., is found in the succeeding zone of Baculites sp. (weak flank ribs). |
| spellingShingle | Cobban, W Kennedy, W Landman, N Platyscaphites, a new ammonite from the Lower Campanian (Upper Cretaceous) of the United States Western Interior |
| title | Platyscaphites, a new ammonite from the Lower Campanian (Upper Cretaceous) of the United States Western Interior |
| title_full | Platyscaphites, a new ammonite from the Lower Campanian (Upper Cretaceous) of the United States Western Interior |
| title_fullStr | Platyscaphites, a new ammonite from the Lower Campanian (Upper Cretaceous) of the United States Western Interior |
| title_full_unstemmed | Platyscaphites, a new ammonite from the Lower Campanian (Upper Cretaceous) of the United States Western Interior |
| title_short | Platyscaphites, a new ammonite from the Lower Campanian (Upper Cretaceous) of the United States Western Interior |
| title_sort | platyscaphites a new ammonite from the lower campanian upper cretaceous of the united states western interior |
| work_keys_str_mv | AT cobbanw platyscaphitesanewammonitefromthelowercampanianuppercretaceousoftheunitedstateswesterninterior AT kennedyw platyscaphitesanewammonitefromthelowercampanianuppercretaceousoftheunitedstateswesterninterior AT landmann platyscaphitesanewammonitefromthelowercampanianuppercretaceousoftheunitedstateswesterninterior |