Late Pliocene and Pleistocene history of the Donnelly Ranch Vertebrate Site, Southeastern Colorado:
Two superposed faunas were discovered in southeastern Colorado at the Donnelly Ranch vertebrate site. Sediments containing a late Blancan assemblage are unconformably overlain by sediments containing a Rancho La Brean assemblage. The pre-Nebraskan Donnelly Ranch fauna is slightly older than the Sand...
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Buch |
| Sprache: | English |
| Veröffentlicht: |
Laramie, Wyo.
University of Wyoming
1974
|
| Schriftenreihe: | Contributions to geology / Special paper
2 |
| Schlagworte: | |
| Zusammenfassung: | Two superposed faunas were discovered in southeastern Colorado at the Donnelly Ranch vertebrate site. Sediments containing a late Blancan assemblage are unconformably overlain by sediments containing a Rancho La Brean assemblage. The pre-Nebraskan Donnelly Ranch fauna is slightly older than the Sand Draw, Broadwater, and Blanco faunas. It is younger than the Curtis Ranch fauna. Faunal and paleomagnetic correlation indicate it is about 2.5 m.y. old. Tapirus, Geoche/one, and Sigmodon indicate the climate was mild and precipitation was much more effective than at present. Savanna, plains, and marsh communities are represented by the fauna. The Sangamon Mesa De Maya fauna correlates best with the early Sangamon Cragin Quarry fauna. Mammals, molluscs, and pollen indicate that temperatures were more equable than present and precipitation may have been slightly more effective during cooler summers. The fauna consists primarily of grassland inhabitants but a marsh com— munity is represented in artesian spring sediments. |
| Beschreibung: | 62 S. graph. Darst., Kt |
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| 245 | 1 | 0 | |a Late Pliocene and Pleistocene history of the Donnelly Ranch Vertebrate Site, Southeastern Colorado |c by Michael W. Hager |
| 264 | 1 | |a Laramie, Wyo. |b University of Wyoming |c 1974 | |
| 300 | |a 62 S. |b graph. Darst., Kt | ||
| 336 | |b txt |2 rdacontent | ||
| 337 | |b n |2 rdamedia | ||
| 338 | |b nc |2 rdacarrier | ||
| 490 | 1 | |a Contributions to geology / Special paper |v 2 | |
| 520 | 3 | |a Two superposed faunas were discovered in southeastern Colorado at the Donnelly Ranch vertebrate site. Sediments containing a late Blancan assemblage are unconformably overlain by sediments containing a Rancho La Brean assemblage. The pre-Nebraskan Donnelly Ranch fauna is slightly older than the Sand Draw, Broadwater, and Blanco faunas. It is younger than the Curtis Ranch fauna. Faunal and paleomagnetic correlation indicate it is about 2.5 m.y. old. Tapirus, Geoche/one, and Sigmodon indicate the climate was mild and precipitation was much more effective than at present. Savanna, plains, and marsh communities are represented by the fauna. The Sangamon Mesa De Maya fauna correlates best with the early Sangamon Cragin Quarry fauna. Mammals, molluscs, and pollen indicate that temperatures were more equable than present and precipitation may have been slightly more effective during cooler summers. The fauna consists primarily of grassland inhabitants but a marsh com— munity is represented in artesian spring sediments. | |
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| indexdate | 2024-07-09T17:33:02Z |
| institution | BVB |
| language | English |
| oai_aleph_id | oai:aleph.bib-bvb.de:BVB01-006116150 |
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| physical | 62 S. graph. Darst., Kt |
| publishDate | 1974 |
| publishDateSearch | 1974 |
| publishDateSort | 1974 |
| publisher | University of Wyoming |
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| series2 | Contributions to geology / Special paper |
| spelling | Hager, Michael W. Verfasser aut Late Pliocene and Pleistocene history of the Donnelly Ranch Vertebrate Site, Southeastern Colorado by Michael W. Hager Laramie, Wyo. University of Wyoming 1974 62 S. graph. Darst., Kt txt rdacontent n rdamedia nc rdacarrier Contributions to geology / Special paper 2 Two superposed faunas were discovered in southeastern Colorado at the Donnelly Ranch vertebrate site. Sediments containing a late Blancan assemblage are unconformably overlain by sediments containing a Rancho La Brean assemblage. The pre-Nebraskan Donnelly Ranch fauna is slightly older than the Sand Draw, Broadwater, and Blanco faunas. It is younger than the Curtis Ranch fauna. Faunal and paleomagnetic correlation indicate it is about 2.5 m.y. old. Tapirus, Geoche/one, and Sigmodon indicate the climate was mild and precipitation was much more effective than at present. Savanna, plains, and marsh communities are represented by the fauna. The Sangamon Mesa De Maya fauna correlates best with the early Sangamon Cragin Quarry fauna. Mammals, molluscs, and pollen indicate that temperatures were more equable than present and precipitation may have been slightly more effective during cooler summers. The fauna consists primarily of grassland inhabitants but a marsh com— munity is represented in artesian spring sediments. Erosion (DE-588)4015366-6 gnd rswk-swf Sediment (DE-588)4054079-0 gnd rswk-swf Mesa De Maya Sediment (DE-588)4054079-0 s Erosion (DE-588)4015366-6 s DE-604 Special paper Contributions to geology 2 (DE-604)BV000904292 2 |
| spellingShingle | Hager, Michael W. Late Pliocene and Pleistocene history of the Donnelly Ranch Vertebrate Site, Southeastern Colorado Erosion (DE-588)4015366-6 gnd Sediment (DE-588)4054079-0 gnd |
| subject_GND | (DE-588)4015366-6 (DE-588)4054079-0 |
| title | Late Pliocene and Pleistocene history of the Donnelly Ranch Vertebrate Site, Southeastern Colorado |
| title_auth | Late Pliocene and Pleistocene history of the Donnelly Ranch Vertebrate Site, Southeastern Colorado |
| title_exact_search | Late Pliocene and Pleistocene history of the Donnelly Ranch Vertebrate Site, Southeastern Colorado |
| title_full | Late Pliocene and Pleistocene history of the Donnelly Ranch Vertebrate Site, Southeastern Colorado by Michael W. Hager |
| title_fullStr | Late Pliocene and Pleistocene history of the Donnelly Ranch Vertebrate Site, Southeastern Colorado by Michael W. Hager |
| title_full_unstemmed | Late Pliocene and Pleistocene history of the Donnelly Ranch Vertebrate Site, Southeastern Colorado by Michael W. Hager |
| title_short | Late Pliocene and Pleistocene history of the Donnelly Ranch Vertebrate Site, Southeastern Colorado |
| title_sort | late pliocene and pleistocene history of the donnelly ranch vertebrate site southeastern colorado |
| topic | Erosion (DE-588)4015366-6 gnd Sediment (DE-588)4054079-0 gnd |
| topic_facet | Erosion Sediment |
| volume_link | (DE-604)BV000904292 |
| work_keys_str_mv | AT hagermichaelw lateplioceneandpleistocenehistoryofthedonnellyranchvertebratesitesoutheasterncolorado |