Costistricklandia gaspeensis Comm., Rockaway Formation (Silurian of the United States)

Where: New York (43.0° N, 79.0° W: paleocoordinates 26.4° S, 45.7° W)

• coordinate based on political unit

• basin-level geographic resolution

When: Rockway Formation, Sheinwoodian (433.4 - 430.5 Ma)

• Age based on correlation chart, Fig. 44.2.

• formation-level stratigraphic resolution

Environment/lithology: offshore ramp; bioturbated, argillaceous dolomite

• "It is difficult to relate this low diversity comm. to others in upper Clinton Grp...may reflect preservational bias due to dolomitization..Based on previous studies, this is BA 4..The C.g. Comm. gives way eastward to the Clorinda-Eoplectodont Subcomm. in more shaley Rockway facies...relatively low-energy setting...preservation of carbonaceous graptolite skeletons at some locations indicates episodic, rapid burial and...low oxygen..."

•2003:04:06 Environmenta/sequence calls by SEP based on Brett's work on NY Silurian and the regional stratigraphic context of the Irondequoit (correlative).

• "commonly strongly bioturbated with Chondrites" "confined to argillaceous dolostones...Certain bedding planes in this unit covered with large valves (internal molds following weathering)...other portions of the same unit largely barren..."

Preservation: replaced with dolomite

Primary reference: C. E. Brett. 1999. Wenlockian fossil communities in New York State and adjacent areas: Paleontology and Paleoecology. In A. J. Boucot, J. D. Lawson (eds.), Paleocommunities: A Case Study from the Silurian and Lower Devonian 592-637 [M. Foote/K. Koverman/J. Alroy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 26862: authorized by Michael Foote, entered by Michael Foote on 06.11.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Pterobranchia
 Dendroidea - Acanthograptidae
Dictyonema sp.
Dictyonema sp. Hall 1851 graptolite
Cephalopoda
 Orthocerida - Dawsonoceratidae
Dawsonoceras sp.
Dawsonoceras sp. Hyatt 1884
Rhynchonellata
 Pentamerida - Stricklandiidae
Costistricklandia gaspeensis
 Atrypida - Atrypidae
Atrypa "reticularis"
Atrypa "reticularis" Linnaeus 1758
 Orthida - Rhipidomellidae
Dalejina hybrida
Dalejina hybrida Sowerby 1839
 Ichnofossils -
Chondrites sp.
Chondrites sp. von Sternberg 1833