USGS I-Map 2495 - Table 3.

Stratigraphic Framework of Cambrian and Ordovician Rocks in the Central Appalachian Basin From Fayette County, Ohio, to Botetourt County, Virginia

Robert T. Ryder, John E. Repetski, and Anita G. Harris,
1996,
U. S. Geological Survey Map Series I-2495

Table 3. Conodonts from the Joy Manufacturing Company corehole VAC-4, Alleghany County, Va. [Twenty-three samples (~500 g each) were taken from the core between 64 and 1,550 ft and processed for conodonts; only the productive samples are listed. CAI, conodont color alteration index is a measure of organic maturation (Epstein and others, 1977)]
Sample Interval (ft)	USGS collection no.	Stratigraphic unit	Conodonts	Age	CAI	Comments
105-106	11042-CO	Perry Limestone, Five Oaks Limestone, Elway Limestone, and Blackford Formation, undivided.	1 Pa element and 1 Sb(?) element of Appalachignathus delicatulus. 2 Curtognathus sp. 1 Pb(?) element and 1 Sc element of Erismodus sp. 9 Panderodus spp. 2 Pa elements and 2 Sc elements of Plectodina sp. or spp. 1 unassigned drepanodontiform element. 6 inderterminate fragments.	Middle Ordovician; late middle Whiterockian (upper part of Histiodollea holodentata Zone) to Blackriveran.	4	Limestone; conodont elements slightly etched and corroded.
195-196	11043-CO	Peery Limestone, Five Oaks Limestone, Elway Limestone, and Blackford Formation, undivided.	1 Pa element, 1 indeterminate P element, and 1 Sb(?) element of Appalachignathus delicatulus. 1 Pa or Sa element of Erismodus sp. 16 Panderodus spp. 1 Sa or Sb element of Plectodina sp. 5 Scalpellodus cf. S. cavus. 1 Staufferella? sp. 1 inderterminate genus and species fragment. 1 Milaculum sp. (non-conodont microfossil).	Middle Ordovician; late middle Whiterockian (upper part of H. holodentata Zone) to Blackriveran.	4-4½	Limestone.
258-259	11044-CO	Peery Limestone, Fiv Oaks Limestone, Elway Limestone, and Blackford Formation, undivided.	5 cardiolloid elements and 2 trucherognathoid elements of Curtognathus sp. 2 Pb elements of Erismodus sp. 1 Sd(?) fragment of Multioistodus? sp. 1 Panderodus sp. 1 Sc element of Phragmodus sp. or Plectodina sp. 1 Sa element and 4 other elements of Rhipidognathus sp. 4 inderterminate genus and species fragments.	Middle Ordovician; late Whiterockian (Phragmodus flexuosus Zone) or younger Middle Ordovician.	4	Limmestone; Rhipidognathus is known from as low as upper Whiterockian Phragmodus flexuosus Zone elsewhere in western central Virginia: Falling Springs 7½-min. quad./ Aleghany Co.; 37°53'55'' N.; 79°54'15'' W.; (USGS unpub. colletion 11053-CO).
456-457	11045-CO	Beekmantown Dolomite	1 Pa element of Diaphorodus delicatus. 1 M element and 1 Sd fragment of ?D. delicatus.	late Early Ordovician (Oepikodus communis Zone) to earliest Middle Ordovician (earliest Whiterockian.	~4	Dolostone; conodont elements etched.
701-702	11046-CO	Beekmantown Dolomite	2 Aloxoconus staufferi. 1 mondent element of Cristodus loxoides. 7 P elements, 10 M elements , 3 Sa elements, 7 Sb/Sd elements, and 9 sc elements of Diaphorodus delicatus. 1 oistodontiform element and 6 drepanodontiform elements of Drepanodus concavus. 4 Eucharodus parallelus. 1 Eucharodus? sp. 20 Glyptoconus quadraplicatus. 1 M element of Oistodus cf. O. bransoni. 3 Oneotodus costatus. 3 "Scandodus" sp. 1 Ulrichodina abnormalis. 1 Ulrichodina? sp. 3 indeterminate coniform elements.	late Early Ordovician (=late Ibexian) (Oepikodus communis Zone).	4	Dolostone.
850-851	11047-CO	Beekmantown Dolomite	1 oistodontiform element and 1 drepanodontiform element of Drepanodus concavus. 1 drepanodontiform element of Drepanodus sp. 1 Oneotodus costatus. 1 Scolopodus cornutiformis. 1 unassigned oistodontiform element. 1 indeterminate coniform element.	middle to late Early Ordovician (=Ibexian) (upper part of Fauna D or Oepikodus communis Zone).	~4	Dolostone; some conodont elements show white patina, probably due to acid etching.
996-997	11048-CO	Beekmantown Dolomite	1 Glyptoconus quadraplicatus.	middle to late Early Ordovician (=Ibexian) (midcontinent Fauna D or Oepikodus communis Zone).	~4	Dolostone.
1,129-1,130	11049-CO	Beekmantown Dolomite	1 indeterminate coniform element fragment; apical end of antero-posteriorly compressed element with faint striae, for example, Rossodus? n. sp.	middle to late Early Ordovician (=Ibexian) (midcontinent Fauna D or Oepikodus communis Zone).	~4	Dolostone.
1,215-1,216	11050-CO	Beekmantown Dolomite	1 Glyptoconus quadraplicatus.	middle to late Early Ordovician (=Ibexian) (midcontinent Fauna D or Oepikodus communis Zone).	~4	Dolostone.
1,370-1,371	11051-CO	Beekmantown Dolomite	1 scandodontiform element and 1 Sa element of Protopanderodus leei. 1 "Scandodus" n. sp. 1 of Repetski (1982). 1 "Scolopodus" gracilis; primitive form. 1 indeterminate genus and species; finely denticulate, blade-like element.	early middle Early Ordovician (=late Ibexian) (lower part of midcontinent Fauna D).	4	Dolostone.
1,409-1,410	11052-CO	Beekmantown Dolomite	1 scandodontiform element of Scolopodus floweri. 3 broken specimens of ?S. floweri. 2 graciliform elements, 1 triangulariform element, and 1 asymmetrical triangulariform element of "Scolopodus" gracilis; primitive form.	early middle Early Ordovician (=late Ibexian) (lower part of midcontinent Fauna D).	4	Dolostone.