Asuncion Group - Henley, Siskiyou (Cretaceous of the United States)

Where: Siskiyou County, California (41.9° N, 122.6° W: paleocoordinates 48.7° N, 88.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Asuncion Group, Coniacian (89.8 - 86.3 Ma)

• Assemblage was found near the base of the Senonian and about 350 ft above the upper Turonian. Coniacian in age.

• bed-level stratigraphic resolution

Environment/lithology: marine

• No paleoenvironmental data reported. Probably shallow marine.
• No lithologic data reported. Probably siliciclastic

Size class: macrofossils

Collection methods: quarrying,

• Collected and identified by Anderson (1895). Published in 1958, so Anderson's taxonomy is probably reasonably reliable.

Primary reference: F. M. Anderson. 1958. Upper Cretaceous of the Pacific Coast. Geological Society of America Memoir 71:1-378 [A. Miller/A. Hendy/M. Clapham]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 44270: authorized by Austin Hendy, entered by Austin Hendy on 07.09.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative, but not exhaustive.
Cephalopoda
 Ammonitida - Anisoceratidae
Anisoceras draconis Anderson 1958 ammonite
misspelled on p. 40 as "Anisoceras draconum n. name"
 Ammonitida - Tetragonitidae
"Lytoceras (Tetragonites) henleyense" = Tetragonites popetensis
"Lytoceras (Tetragonites) henleyense" = Tetragonites popetensis Yabe 1903 ammonite
 Ammonitida - Pachydiscidae
Parapachydiscus henleyensis Anderson 1902 ammonite
 Ammonitida - Desmoceratidae
"Kotoceras aff. richardsoni" = Damesites sugata
"Kotoceras aff. richardsoni" = Damesites sugata Forbes 1846 ammonite
 Ammonitida - Placenticeratidae
Metaplacenticeras californicum Anderson 1902 ammonite
Metaplacenticeras pacificum Smith 1900 ammonite
Bivalvia
 Myalinida - Inoceramidae
Inoceramus subundatus Meek 1861 clam
Inoceramus aff. pembertoni Waring 1917 clam