Locality A-1230 Block 3 (Ordovician of the United States)

Also known as 78WG162

Where: Alaska (62.2° N, 155.0° W: paleocoordinates 62.1° N, 155.0° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Telsitna Formation, Sandbian (458.4 - 453.0 Ma)

• Likely basal Sandbian given discussion.

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; lithified limestone and siltstone

• The limestone beds were deposited below storm-wave base by debris flows and turbidity currents beyond the shelf margin break or on a distally steepened ramp (Potter et al. 1988; Rigby et al. 1988).
• Six loose limestone blocks were collected at this locality (Rigby et al. 1988). These are associated with a siltstone-shale succession with interbedded limestone.

Size class: macrofossils

Preservation: replaced with silica

Reposited in the USNM

Primary reference: C. M. O. Rasmussen, D. A. T. Harper, and R. B. Blodgett. 2012. Late Ordovician brachiopods from west-central Alaska: systematics, ecology and palaeobiogeography. Fossils and Strata 58:1-103 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 164856: authorized by Pete Wagner, entered by Pete Wagner on 20.12.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Rhynchonellata
 Orthida - Orthidae
Taphrorthis immatura
Taphrorthis immatura Williams and Curry 1985
Five ventral, three dorsal and five fragments
 Orthida - Hesperorthidae
Ptychopleurella uniplicata
Ptychopleurella uniplicata Cooper 1956
Two dorsal valves
 Orthida - Phragmorthidae
Phragmorthis buttsi
Phragmorthis buttsi Cooper 1956
One dorsal valve
Strophomenata
 Strophomenida - Strophomenidae
Tetraphalerella planobesa
Tetraphalerella planobesa Cooper 1956
Two ventral valves
 Strophomenida - Bimuriidae
Bimuria (Bimuria) gilbertella
Bimuria (Bimuria) gilbertella Potter 1991
One ventral valve and one indeterminable fragment
 Strophomenida - Sowerbyellidae
Sowerbyella (Sowerbyella) rectangularis
Sowerbyella (Sowerbyella) rectangularis Rasmussen et al. 2012
Two ventral valves
 Strophomenida - Hesperomenidae
Anoptambonites grayae
Anoptambonites grayae Davidson 1883
Four ventral and one dorsal valve
 Strophomenida - Leptellinidae
Leptelloidea ? leptelloides
Leptelloidea ? leptelloides Bekker 1922
One dorsal fragment