CAS Loc. 444 - Hornbrook (Cretaceous of the United States)

Where: Siskiyou County, California (41.9° N, 122.6° W: paleocoordinates 51.8° N, 92.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Campanian (83.6 - 72.1 Ma)

• LITHOSTRATIGRAPHIC RELATIONS: From an unnamed lithostratigraphic unit. AGE: Campanian, on the basis of ammonite biostratigraphy. STRATIGRAPHIC POSITION: From presumably higher part of section in this area; 400 ft above zone of Metaplacenticeras.

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified, concretionary, shelly/skeletal siliciclastic sediments

• ENVIRONMENT: Not reported in text, but apparently shallow marine siliciclastic.
• LITHOLOGY: Not reported in text, but apparently siliciclastic. LITHIFICATION: Lithified, on the basis of figured specimens and facies descriptions.

Size class: macrofossils

Collected by Anderson; reposited in the CAS

Collection methods: surface (in situ),

• COLLECTOR: F. M. Anderson. REPOSITORY: California Academy of Science (CAS).

Primary reference: T. Matsumoto. 1960. Upper Cretaceous ammonites of California. Part III. Memoirs of the Faculty of Science, Kyushu University Series D, Geology, Special Volume II 1-204 [A. Hendy/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 86809: authorized by Austin Hendy, entered by Austin Hendy on 18.02.2009, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for Ammonoidea and characteristic taxa listed in ammonoidea publication. NOMENCLATURE: From authoritative publication, but with slightly older nomenclatural; with species-resolution identifications.
Cephalopoda
 Ammonitida - Vascoceratidae
"Anapachydiscus siskiyouensis" = Fagesia siskiyouensis
"Anapachydiscus siskiyouensis" = Fagesia siskiyouensis Anderson 1931 ammonite
 Ammonitida - Tetragonitidae
"Lytoceras (Tetragonites) henleyense n. sp." = Tetragonites popetensis
"Lytoceras (Tetragonites) henleyense n. sp." = Tetragonites popetensis Yabe 1903 ammonite
 Ammonitida - Pachydiscidae
Eupachydiscus haradai Jimbo 1894 ammonite
SUBSPECIES: Eupachydiscus haradai haradai
 Ammonitida - Desmoceratidae
Desmophyllites diphylloides Forbes 1846 ammonite
Gastropoda
 Heterostropha - Acteonidae
"Acteonella rustica" = Trochactaeon (Trochactaeon) frazierensis Anderson 1958 snail