Blue Point, AZ (A1-1) (Cretaceous of the United States)

Where: Cocconino County, Arizona (35.7° N, 110.8° W: paleocoordinates 37.1° N, 74.1° W)

• small collection-level geographic resolution

When: Sciponoceras zone, Mancos Shale Formation, Late/Upper Cenomanian (99.6 - 93.5 Ma)

• Bed horizon is the sample number not the lithologic unit number. The lithologic unit numbers that correspond to the sample numbers given can be found in reference for collection (Elder, 87).

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, burrowed, silty, calcareous sandstone

• Very fine grained, olive gray, well indurated.

Note: Section A1 constitutes interbedded limestones, sandstones, and shales, but this sedimentary structure is not reflected in the descriptions of each collection, as each is often a single bed, or a portion thereof.

Size class: macrofossils

Collection methods: bulk, mechanical,

• Bulk sample disaggregated in lab.

Primary reference: W. P. Elder. 1987. The paleoecology of the Cenomanian-Turonian (Cretaceous) stage boundary extinctions at Black Mesa, Arizona. Palaios 2(1):24-40 [C. Marshall/S. Low/A. Clement]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 2171: authorized by Charles Marshall, entered by Sofy Low on 23.06.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Polychaeta
 Sabellida - Serpulidae
Serpula intrica
Cephalopoda
 Ammonitida - Acanthoceratidae
Metoicoceras sp.
Metoicoceras sp. Hyatt 1903 ammonite
 Ammonitida - Baculitidae
Sciponoceras sp.
Sciponoceras sp. Hyatt 1894 ammonite
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
originally entered as "Gastropod indet."
 Cerithioidea - Turritellidae
Turritella sp.
Turritella sp. Lamarck 1799 turret shell
Bivalvia
  -
Bivalvia indet.
Bivalvia indet. Linnaeus 1758 clam
"infaunal" [originally entered as "Bivalve indet."]
 Pholadida - Corbulidae
Corbula sp.
Corbula sp. Bruguière 1789 clam
 Cardiida - Mactridae
Cymbophora sp.
Cymbophora sp. Gabb 1869 clam
 Lucinida - Lucinidae
Lucina sp.
Lucina sp. Bruguière 1797 clam
 Mytilida - Mytilidae
Lithophaga sp.
Lithophaga sp. Röding 1798 mussel
 Myalinida - Inoceramidae
Inoceramidae indet., Inoceramus flavus
Inoceramidae indet. Giebel 1852 clam
originally entered as "informal Inoceramid indet."; changed by JA 21.2.07
Inoceramus flavus clam
"flavus flavus" - originally entered as "Inoceramus flavus flavus"
 Pectinida - Limidae
Lima sp.
Lima sp. Bruguière 1797 file clam
 Ostreida - Bakevelliidae
Pseudoptera sp.
Pseudoptera sp. Meek 1873 oyster
 Ostreida - Malleidae
Vulsella sp.
Vulsella sp. Ršding 1798 oyster
originally entered as "Volsella sp."
 Ostreida - Gryphaeidae
Pycnodonte newberryi, Exogyra levis, Exogyra acroumbonata, Gryphaeostrea sp.
Gryphaeostrea sp. Conrad 1865 oyster
Mesostoma
  -
Mesostoma sp.
Mesostoma sp. Ehrenberg 1837