Mountain House (Devonian of the United States)

Also known as Schizophoria Community, Lochkovian, Mountain House, Siskiyou County, California

Where: Siskiyou County, California (41.4° N, 122.6° W: paleocoordinates 11.8° S, 62.9° W)

• coordinate stated in text

• local area-level geographic resolution

When: Salmon Hornblende Schist Formation, Lochkovian (419.2 - 410.8 Ma)

• PJW: Given Macrostrat, this should be some rock unit within the Salmon Hornblende Schist.

• formation-level stratigraphic resolution

Environment/lithology: marine; limestone

• "BA 3...normal turbulence and oxygen."

•

•SEP added: "normal turbulence and oxygen-level unit as indicated byh the common occurrence of a large number and percentage of articualted specimens as well as by the fine-grained nature of the matrix and the absence of such features as fine laminae, high free carbon, and abundant pyrite."

•NOTE: environmental description here is incomplete and I [SEP] am unable to assign anything to this unit without additional research. No formation is given, although it should be possible to track this via tha USNM locality number.

• "Gedinnian age limestone and greenstone....fine-grained"; SEP added from the reference: "shells may be either articulated or disarticulated and may or may not occur in coquinas as contrasted with reasonable population density aggregations. The shells do not commonly touch each other. The sediment is commonly fine-grained to fine- or medium-sand sized material. Bed thicknesses are in the few centimeters range"

•NOTE: From the lithological description of this collection, it is not clear whether the author even means carbonate vs. siliciclastic, though I [SEP] suspect clastic. I have therefore removed any lithological assignment.

Size class: macrofossils

Reposited in the USNM

• Abundances given in text.

Primary reference: A. J. Boucot. 1999. Some Wenlockian-Geddinian, chiefly brachiopod dominated communities of North America. In A. J. Boucot, J. D. Lawson (eds.), Paleocommunities--a case study from the Silurian and Lower Devonian 549-591 [M. Foote/M. Foote/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 24910: authorized by Michael Foote, entered by Michael Foote on 22.08.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Strophomenata
 Strophomenida - Amphistrophiidae
? Mesodouvillina sp.
? Mesodouvillina sp. Williams 1950
Rhynchonellata
 Pentamerida - Gypidulidae
Gypidula sp.
Gypidula sp. Hall 1867
genus name in quotes
 Atrypida - Atrypidae
Atrypa reticularis
Atrypa reticularis Linnaeus 1758
species name in quotes
 Orthida - Schizophoriidae
Schizophoria aff. bisinuata
 Spiriferinida - Cyrtinidae
Cyrtina sp.
Cyrtina sp. Davidson 1858
 Spiriferida - Delthyrididae
Howellella sp.
Howellella sp. Kozlowski 1946