Geology of the Ponca Creek and Keya Paha River Drainage Basins in Nebraska
The geology of the study area has been investigated many times over more than a century. Interested readers are directed to the report by Diffendal and Voorhies (1994), which gives a more detailed overview of the results of the investigations and lists most of the more important reports about the ar...
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ftunivnebraskali:oai:digitalcommons.unl.edu:diffendal-1051 2023-11-12T04:13:34+01:00 Geology of the Ponca Creek and Keya Paha River Drainage Basins in Nebraska Diffendal, Robert F., Jr. 1997-09-01T07:00:00Z application/pdf https://digitalcommons.unl.edu/diffendal/51 https://digitalcommons.unl.edu/context/diffendal/article/1051/viewcontent/Archaeological_Survey_Ponca_Keya_Paha_Diffendal_Sep_97_REV.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/diffendal/51 https://digitalcommons.unl.edu/context/diffendal/article/1051/viewcontent/Archaeological_Survey_Ponca_Keya_Paha_Diffendal_Sep_97_REV.pdf Robert F. Diffendal, Jr., Publications Earth Sciences Geology Geomorphology Hydrology Stratigraphy text 1997 ftunivnebraskali 2023-10-30T11:31:50Z The geology of the study area has been investigated many times over more than a century. Interested readers are directed to the report by Diffendal and Voorhies (1994), which gives a more detailed overview of the results of the investigations and lists most of the more important reports about the area’s geology. The names of the sedimentary rock strata and unlithified sediments exposed in and underlying all or parts of the study area are shown in Table V.I. These formations range in age from more than 85 million years to sediments being deposited today by winds, water, and downslope movements (landslides). The oldest sedimentary rocks belonging to the Niobrara Formation and younger Pierre Shale were deposited on the floor of a seaway that connected the Gulf of Mexico with the Arctic Ocean near the end of the Cretaceous Period. The Niobrara Formation is exposed only along the lower valley sides at the downstream end of Ponca Creek in Boyd County and along the lower valley sides along the Missouri River. The Niobrara Formation consists primarily of gray to white chalks, shaley chalks, and limestones formed mainly of the microscopic limey skeletal debris from marine plants. Larger fossils of clams, oysters, cephalopods, fish, and marine reptiles occur in this formation. The Pierre Shale is composed principally of gray to black platey shales and limey shales. Sulfur-bearing minerals in the shale often yield a rotten-egg odor in the air above exposures. Neither of these formations yields significant materials for tools. Text Arctic Arctic Ocean University of Nebraska-Lincoln: DigitalCommons@UNL Arctic Arctic Ocean Rotten ENVELOPE(-53.417,-53.417,68.867,68.867) |
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University of Nebraska-Lincoln: DigitalCommons@UNL |
op_collection_id |
ftunivnebraskali |
language |
unknown |
topic |
Earth Sciences Geology Geomorphology Hydrology Stratigraphy |
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Earth Sciences Geology Geomorphology Hydrology Stratigraphy Diffendal, Robert F., Jr. Geology of the Ponca Creek and Keya Paha River Drainage Basins in Nebraska |
topic_facet |
Earth Sciences Geology Geomorphology Hydrology Stratigraphy |
description |
The geology of the study area has been investigated many times over more than a century. Interested readers are directed to the report by Diffendal and Voorhies (1994), which gives a more detailed overview of the results of the investigations and lists most of the more important reports about the area’s geology. The names of the sedimentary rock strata and unlithified sediments exposed in and underlying all or parts of the study area are shown in Table V.I. These formations range in age from more than 85 million years to sediments being deposited today by winds, water, and downslope movements (landslides). The oldest sedimentary rocks belonging to the Niobrara Formation and younger Pierre Shale were deposited on the floor of a seaway that connected the Gulf of Mexico with the Arctic Ocean near the end of the Cretaceous Period. The Niobrara Formation is exposed only along the lower valley sides at the downstream end of Ponca Creek in Boyd County and along the lower valley sides along the Missouri River. The Niobrara Formation consists primarily of gray to white chalks, shaley chalks, and limestones formed mainly of the microscopic limey skeletal debris from marine plants. Larger fossils of clams, oysters, cephalopods, fish, and marine reptiles occur in this formation. The Pierre Shale is composed principally of gray to black platey shales and limey shales. Sulfur-bearing minerals in the shale often yield a rotten-egg odor in the air above exposures. Neither of these formations yields significant materials for tools. |
format |
Text |
author |
Diffendal, Robert F., Jr. |
author_facet |
Diffendal, Robert F., Jr. |
author_sort |
Diffendal, Robert F., Jr. |
title |
Geology of the Ponca Creek and Keya Paha River Drainage Basins in Nebraska |
title_short |
Geology of the Ponca Creek and Keya Paha River Drainage Basins in Nebraska |
title_full |
Geology of the Ponca Creek and Keya Paha River Drainage Basins in Nebraska |
title_fullStr |
Geology of the Ponca Creek and Keya Paha River Drainage Basins in Nebraska |
title_full_unstemmed |
Geology of the Ponca Creek and Keya Paha River Drainage Basins in Nebraska |
title_sort |
geology of the ponca creek and keya paha river drainage basins in nebraska |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
1997 |
url |
https://digitalcommons.unl.edu/diffendal/51 https://digitalcommons.unl.edu/context/diffendal/article/1051/viewcontent/Archaeological_Survey_Ponca_Keya_Paha_Diffendal_Sep_97_REV.pdf |
long_lat |
ENVELOPE(-53.417,-53.417,68.867,68.867) |
geographic |
Arctic Arctic Ocean Rotten |
geographic_facet |
Arctic Arctic Ocean Rotten |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_source |
Robert F. Diffendal, Jr., Publications |
op_relation |
https://digitalcommons.unl.edu/diffendal/51 https://digitalcommons.unl.edu/context/diffendal/article/1051/viewcontent/Archaeological_Survey_Ponca_Keya_Paha_Diffendal_Sep_97_REV.pdf |
_version_ |
1782331512702631936 |