Foraminiferal Biostratigraphy and Paleoenvironmental Analysis of the Anahuac Formation (Late Oligocene-Early Miocene) from a Deep Well in Vermilion Parish, Louisiana
In the subsurface of Vermilion Parish, Louisiana, sediments from the Anahuac Formation in the #1 J. W. Steen well are assigned an Upper Oligocene-Lower Miocene age based on planktonic foraminifera. Previous age determinations for sediments from this formation elsewhere range from Middle to Late Olig...
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ftolddominionuni:oai:digitalcommons.odu.edu:oeas_etds-1270 2024-04-14T08:18:29+00:00 Foraminiferal Biostratigraphy and Paleoenvironmental Analysis of the Anahuac Formation (Late Oligocene-Early Miocene) from a Deep Well in Vermilion Parish, Louisiana Orndorff, Audrey Lynne 1988-07-01T07:00:00Z application/pdf https://digitalcommons.odu.edu/oeas_etds/270 https://doi.org/10.25777/bb3w-pj22 https://digitalcommons.odu.edu/context/oeas_etds/article/1270/viewcontent/Orndorff_ForaminiferalBiostratigraphyAnd_1988_Redacted.pdf unknown ODU Digital Commons https://digitalcommons.odu.edu/oeas_etds/270 doi:10.25777/bb3w-pj22 https://digitalcommons.odu.edu/context/oeas_etds/article/1270/viewcontent/Orndorff_ForaminiferalBiostratigraphyAnd_1988_Redacted.pdf In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). OES Theses and Dissertations Stratigraphic Foraminifera Vermilion Parish (La.) Geology Paleontology Stratigraphy text 1988 ftolddominionuni https://doi.org/10.25777/bb3w-pj22 2024-03-21T15:49:29Z In the subsurface of Vermilion Parish, Louisiana, sediments from the Anahuac Formation in the #1 J. W. Steen well are assigned an Upper Oligocene-Lower Miocene age based on planktonic foraminifera. Previous age determinations for sediments from this formation elsewhere range from Middle to Late Oligocene based on the presence of larger foraminifera contained within these strata. Planktonic foraminifera in Anahuac formation sediments in the #1 J. W. Steen well permit their assignment to an established worldwide zonation scheme and indicate that the age ranges from the Globorotalia kugleri Interval Zone (Upper Oligocene) to the Catapsydrax dissimilis Zone (Lower Miocene). Benthic foraminiferal assemblages indicate the presence of the Heterostegina and Discorbis Zones in the Anahuac Formation with the Oligocene-Miocene boundary level occuring within the Discorbis Zone. Paleoenvironmental reconstructions based upon benthic foraminifera indicate that the sediments of the Anahuac Formation within the well were deposited in marine waters ranging from 100 to 200 meters depth and decreased up section to depths of 20 to 100 meters. Possible explanations for this shallowing upwards sequence include, but are not limited to, eustatic sea level fall, increased regional sediment supply, or local variation in sedimentation and subsidence rates Text Planktonic foraminifera Old Dominion University: ODU Digital Commons Steen ENVELOPE(7.780,7.780,62.571,62.571) |
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Old Dominion University: ODU Digital Commons |
op_collection_id |
ftolddominionuni |
language |
unknown |
topic |
Stratigraphic Foraminifera Vermilion Parish (La.) Geology Paleontology Stratigraphy |
spellingShingle |
Stratigraphic Foraminifera Vermilion Parish (La.) Geology Paleontology Stratigraphy Orndorff, Audrey Lynne Foraminiferal Biostratigraphy and Paleoenvironmental Analysis of the Anahuac Formation (Late Oligocene-Early Miocene) from a Deep Well in Vermilion Parish, Louisiana |
topic_facet |
Stratigraphic Foraminifera Vermilion Parish (La.) Geology Paleontology Stratigraphy |
description |
In the subsurface of Vermilion Parish, Louisiana, sediments from the Anahuac Formation in the #1 J. W. Steen well are assigned an Upper Oligocene-Lower Miocene age based on planktonic foraminifera. Previous age determinations for sediments from this formation elsewhere range from Middle to Late Oligocene based on the presence of larger foraminifera contained within these strata. Planktonic foraminifera in Anahuac formation sediments in the #1 J. W. Steen well permit their assignment to an established worldwide zonation scheme and indicate that the age ranges from the Globorotalia kugleri Interval Zone (Upper Oligocene) to the Catapsydrax dissimilis Zone (Lower Miocene). Benthic foraminiferal assemblages indicate the presence of the Heterostegina and Discorbis Zones in the Anahuac Formation with the Oligocene-Miocene boundary level occuring within the Discorbis Zone. Paleoenvironmental reconstructions based upon benthic foraminifera indicate that the sediments of the Anahuac Formation within the well were deposited in marine waters ranging from 100 to 200 meters depth and decreased up section to depths of 20 to 100 meters. Possible explanations for this shallowing upwards sequence include, but are not limited to, eustatic sea level fall, increased regional sediment supply, or local variation in sedimentation and subsidence rates |
format |
Text |
author |
Orndorff, Audrey Lynne |
author_facet |
Orndorff, Audrey Lynne |
author_sort |
Orndorff, Audrey Lynne |
title |
Foraminiferal Biostratigraphy and Paleoenvironmental Analysis of the Anahuac Formation (Late Oligocene-Early Miocene) from a Deep Well in Vermilion Parish, Louisiana |
title_short |
Foraminiferal Biostratigraphy and Paleoenvironmental Analysis of the Anahuac Formation (Late Oligocene-Early Miocene) from a Deep Well in Vermilion Parish, Louisiana |
title_full |
Foraminiferal Biostratigraphy and Paleoenvironmental Analysis of the Anahuac Formation (Late Oligocene-Early Miocene) from a Deep Well in Vermilion Parish, Louisiana |
title_fullStr |
Foraminiferal Biostratigraphy and Paleoenvironmental Analysis of the Anahuac Formation (Late Oligocene-Early Miocene) from a Deep Well in Vermilion Parish, Louisiana |
title_full_unstemmed |
Foraminiferal Biostratigraphy and Paleoenvironmental Analysis of the Anahuac Formation (Late Oligocene-Early Miocene) from a Deep Well in Vermilion Parish, Louisiana |
title_sort |
foraminiferal biostratigraphy and paleoenvironmental analysis of the anahuac formation (late oligocene-early miocene) from a deep well in vermilion parish, louisiana |
publisher |
ODU Digital Commons |
publishDate |
1988 |
url |
https://digitalcommons.odu.edu/oeas_etds/270 https://doi.org/10.25777/bb3w-pj22 https://digitalcommons.odu.edu/context/oeas_etds/article/1270/viewcontent/Orndorff_ForaminiferalBiostratigraphyAnd_1988_Redacted.pdf |
long_lat |
ENVELOPE(7.780,7.780,62.571,62.571) |
geographic |
Steen |
geographic_facet |
Steen |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
OES Theses and Dissertations |
op_relation |
https://digitalcommons.odu.edu/oeas_etds/270 doi:10.25777/bb3w-pj22 https://digitalcommons.odu.edu/context/oeas_etds/article/1270/viewcontent/Orndorff_ForaminiferalBiostratigraphyAnd_1988_Redacted.pdf |
op_rights |
In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). |
op_doi |
https://doi.org/10.25777/bb3w-pj22 |
_version_ |
1796317989779275776 |