Where: Smyth County, Virginia (36.9° N, 81.7° W: paleocoordinates 29.7° S, 62.0° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Nemagraptus gracilis graptolite zone, Effna Limestone Member (Edinburg Formation), Ashbyan (457.3 - 449.6 Ma)
• Base of unit.
• group of beds-level stratigraphic resolution
Environment/lithology: reef, buildup or bioherm; limestone
•the type locality it attains a thickness of about 221 feet, but it is thinner to the southwest along the same belt and also in the northern belt. One of the best places for the study of this formation is at the Porterfield Quarry, 5 miles east of Saltville. At this place the Effna formed a great reef (now quarried away) at the base of the Rich Valley formation.
Size classes: macrofossils, mesofossils
Primary reference: H. B. Whittington. 1956. The trilobite family Isocolidae. Journal of Paleontology 30(5):1193-1198 [B. Kröger/B. Kröger]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 164296: authorized by Björn Kröger, entered by Björn Kröger on 28.11.2014, edited by Pete Wagner
Creative Commons license: CC BY (attribution)
Taxonomic list
Trilobita | |
Holdenia typa Cooper 1953 trilobite | |
Lingulata | |
Conotreta plana Cooper 1956
Conotreta cuspidata Cooper 1956 | |
Schizambon "sp. 1", "Schizambon cuneatum" = Multispinula cuneata
Schizambon "sp. 1" Walcott 1884
"Schizambon cuneatum" = Multispinula cuneata Willard 1928 | |
"Pachyglossa pachydermata" = Pachyglossella
Elliptoglossa ovalis Bassler 1919
Elliptoglossa rotundata Cooper 1956 | |
Rhynchonellata | |
Skenidioides transversus n. sp.
Skenidioides transversus n. sp. | |
Perimecocoelia semicostata Cooper 1956 | |
"? Doleroides ponderosus n. sp." = Famatinorthis ponderosus, Scaphorthis "sp. 1", Scaphorthis perplexa n. sp.
"? Doleroides ponderosus n. sp." = Famatinorthis ponderosus Cooper 1956
Scaphorthis "sp. 1" Cooper 1956
Scaphorthis perplexa n. sp. Cooper 1956 | |
Phragmorthis buttsi n. gen. n. sp.
Phragmorthis buttsi n. gen. n. sp. Cooper 1956 | |
Ptychopleurella rectangulata n. sp., Ptychopleurella mediocostata n. sp.
Ptychopleurella rectangulata n. sp. Cooper 1956
Ptychopleurella mediocostata n. sp. Cooper 1956 | |
Cyrtonotella grandistriata Cooper 1956 | |
"Orthambonites parvicrassicostatus" = Sulevorthis parvicrassicostatus, Orthambonites divaricatus, Taphrorthis peculiaris
"Orthambonites parvicrassicostatus" = Sulevorthis parvicrassicostatus Cooper 1956
Taphrorthis peculiaris Cooper 1956 | |
Glyptorthis glypta n. sp., Eridorthis inexpecta n. sp.
Glyptorthis glypta n. sp. Cooper 1956
Eridorthis inexpecta n. sp. Cooper 1956 | |
Laticrura pionodema n. gen. n. sp.
Laticrura pionodema n. gen. n. sp. Cooper 1956 | |
Strophomenata | |
Dactylogonia "sp. 5" Ulrich and Cooper 1942 | |
Christiania subquadrata Hall 1883 | |
Ptychoglyptus virginiensis Willard 1928 | |
Palaeostrophomena subtransversa n. sp. Cooper 1956
Glyptambonites glyptus n. sp. Cooper 1956 | |
Bimuria superba, Bimuria immatura n. sp.
Bimuria superba Ulrich and Cooper 1942
Bimuria immatura n. sp. Cooper 1956 | |
Oxoplecia holstonensis Willard 1928
Oxoplecia multicostellata Cooper 1956 | |
Kullervo parva n. sp., Kullervo ornata n. sp.
Kullervo parva n. sp. Cooper 1956
Kullervo ornata n. sp. Cooper 1956 |