5 edition of Coccolith correlation of Late Cretaceous Point Loma Formation at La Jolla and Carlsbad, San Diego County, California found in the catalog.
Cover title.Includes bibliographical references (leaf 23).
|Statement||U.S. Geological Survey|
|Publishers||U.S. Geological Survey|
|The Physical Object|
|Pagination||xvi, 115 p. :|
|Number of Pages||53|
|2||U.S. Geological Survey open-file report -- 94-678.|
|3||Open-file report -- 94-678.|
nodata File Size: 3MB.
1, 2001 SQUIRES AND SAUL—PACIFIC SLOPE CRETACEOUS GASTROPODS slightly proscocline but sigmoidal near suture; anterior canal twisted and bent slightly to left. Reconsideration of that placement and examination of Rhachiosoma granuliferum indicates that Portunites triangulum and R. Another portunid taxon assignable to a genus closely related to Minohellenus, Portunites insculptahas been described from the Eocene Llajas Formation. The major claw, together with the longitudinal carina on the exopod of the uropod, conforms precisely to the definition of that structure in Ctenocheles and helps to confirm placement in the genus.
pacificum Zone, and the Cedar District Formation on Texada Island might be somewhat younger than that on Sucia Island.
Palaeopinnixa appears to have evolved in the high southern latitudes during the Paleocene and subsequently dispersed to the northern hemisphere, becoming extinct in the southern hemisphere. If that same relationship is applied to N. Future work might possibly reveal that the two genera are synonymous, but for now, Nudivagus appears to be a valid taxon. Dorsal surface of eye flattened. Department of Earth and Biological Sciences, Loma Linda University, Loma Linda, CA, 92350, USA Torrey Nyborg• japonica by having opisthocyrt rather than mostly prosocline growth lines and by having weaker spiral ribbing.
Subfamily CallichirinaeGenus Neocallichirus Type Species Neocallichirus horneriby original designation.
Better understanding of the ecology and life habits of the organism will be possible only with the addition San Diego County new material including the pereiopods and ventral aspect. Ammonites from the Saratoga Chalk Upper CretaceousArkansas. SDSNH 81099—81101 and 81104 were collected from locality 4529.
Some Cretaceous Mollusca from Japanese Saghalin and Hokkaido Lamellibranchiata and Gastropoda. TROCHACANTHUS PACIFICUS new species Figure 3.
Minor chela with ovoid manus, about twice as long as high; surface gently vaulted, with subtle longitudinal keel mesially, generally smooth. Scale bars equal to 1 cm.
Section HeterotremataSuperfamily PortunoideaFamily PortunidaeSubfamily Psammocarcininae Included Genera Acanthoportunus n.
9; minor fixed finger length, 10.