Geobulletin alpha

Source info:

Author:	Dave
Date:	2016-05-06 09:01:00
Blog:	Views of the Mahantango
URL:	http://viewsofthemahantango.blogspot.com/2016/05/oxoplecia-gouldi-brachiopod-from-viola.html

Summary:

Among the rubble that was the eroding rock of the Viola formation I found a few good examples of the brachiopod Oxoplecia gouldi. The shell is subrectangular to suboval in outline with both valves roughly equal in size and depth. There is a wide, shallow fold and sulcus structure present along with fine, widely spaced radiating striae on the surface of the valves. The pedicle valve extends out and curves back over the brachial valve. There is a wide, triangular interarea on the pedicle valve that is almost as long as the hinge line.Specimen #1Brachial valveAnteriorPedicle valvePosteriorProfileSpecimen #2Brachial valveAnteriorPedicle valvePosteriorProfileThese specimens comes from the Viola formation which is upper Ordovician (Sandbian to Katian stage) in age and overlies (unconformably?) the Bromide formation. I found them in a road cut along US 177, south of Sulphur, Oklahoma.

Content analysis:

Stratigraphic context:

Recognized stratigraphic terms [n]:	Ordovician [1] Katian [1] Sandbian [1]
Agenames chronostratigraphy [rating]:	Ordovician [0.67] Paleozoic [0.67] Phanerozoic [0.67] Katian [0.1] Sandbian [0.1] Upper Ordovician [0.5]

Geographic context:

Location	Country	Latitude	Longitude
Oklahoma	US	35.3091	-98.521
Sulphur	US	34.5109	-96.9678
United States	US	37.1679	-95.845

Keywords:

1Brachial valveAnteriorPedicle valvePosteriorProfileSpecimen, 2Brachial valveAnteriorPedicle valvePosteriorProfileThese, Brachiopod, brachiopod Oxoplecia gouldi, Bromide formation, depth, fine, good examples, hinge line.Specimen, Katian stage, Oklahoma, outline, Oxoplecia gouldi brachiopod, pedicle valve, road cut, rock, rubble, shallow fold, shell, size, striae, sulcus structure, Sulphur, triangular interarea, valves, Viola formation