Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Silurian conodonts from Wills Mountain Anticline, Virginia, West Virginia, and Maryland

Charles T. Helfrich
Silurian conodonts from Wills Mountain Anticline, Virginia, West Virginia, and Maryland
Special Paper - Geological Society of America (1975) (161): 82 pp.

Abstract

Conodont biostratigraphy is established for complete sections of the Mifflintown, Wills Creek, and Tonoloway Formations along the Wills Mountain anticline in the central Appalachian Mountains. The Rochester Member is renamed the Cosner Gap Member of the Mifflintown Formation. The succession of conodont faunas described for these formations ranges in age from latest Wenlock through Pridoli. The fauna includes 46 forms (species) assignable to the form genera Hindeodella, Ligonodina, Lonchodina, Neoprioniodus Ozarkodina, Panderodus, Plectospathodus, Spathognathodus, and TRICHONODELLA: Sixteen new form species and subspecies are described, and twelve of these are named: Ligonodina brevis, Ozarkodina edithae mariae, O. typica intermedia, O serrata, O. sinuosa, O. ziegleri crassatoides, Spathognathodus bicornutus, S. primus highlandensis, S. primus multidentatus, S. tillmani, S. walliseri, and Synprioniodina lowryi. One platform species, possibly representing a new form genus, occurs in the upper Tonoloway Formation. The important European forms Spathognathodus sagitta bohemicus, S. snajdri, S. crispus, and S. steinhornensis eosteinhornensis are reported for the first time from the central Appalachian Mountains. Eleven multielement conodont species are recognized using open nomenclature. Spathognathodus primus and S. sagitta bohemicus lineages in the fauna are important in delimiting six local concurrent range zones. Three zones are described for the Mifflintown Formation: the S. sagitta bohemicus, S. bicornutus, and S snajdri Zones. Three zones are described for the Wills Creek and Tonoloway Formations: the Spathognathodus tillmani, S. crispus, and S. steinhornensis eosteinhornensis Zones. The Gedinnian form Icriodus woschmidti does not appear lower than the base of the New Creek Limestone or, possibly, the upper few meters of the Keyser Limestone. The faunas of the S. sagitta bohemicus, S. snajdri, S. crispus, and S. steinhornensis eosteinhornensis Zones correlate with the sagitta, snajdri horizon of the siluricus crispus, and eosteinhornensis Zones of Walliser. The S. bicornutus and S. tillmani Zones are tentatively correlated with Walliser"s crassa and latialatus Zones


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Issue: 161
Title: Silurian conodonts from Wills Mountain Anticline, Virginia, West Virginia, and Maryland
Author(s): Helfrich, Charles T.
Affiliation: East. Ky. Univ., Dep. Geol., Richmond, Ky., United States
Published: 1975
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 978-0-81372-161-3
Number of pages: 82
Accession Number: 1976-007485
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Monographic
Annotation: Appendix contains microfiche of systematic paleontology in pocket
Illustration Description: illus. incl. strat. cols., plates, tables
N33°00'00" - N47°30'00", W87°00'00" - W67°00'00"
N37°55'00" - N39°43'00", W79°30'00" - W75°04'60"
N36°34'60" - N39°28'00", W83°34'60" - W75°15'00"
N37°15'00" - N40°40'00", W82°30'00" - W77°45'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute.
Update Code: 1976
Close Modal

or Create an Account

Close Modal
Close Modal