By Clarence A. Hall Jr.
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Extra info for Nearshore marine paleoclimatic regions, increasing zoogeographic provinciality, molluscan extinctions, and paleoshorelines, California: Late Oligocene (27 Ma) to late Pliocene (2.5 Ma) (GSA Special Paper 357)
With these data, the ET for each line of latitude and for each present-day molluscan provincial boundary along the coast of California can be calculated. Determining the mean annual sea-surface paleotemperature (T) in the ancient Pacific Ocean and along the west coast of California from fossil molluscan distribution patterns is not feasible using temperatures at endpoints of geographic ranges of molluscan taxa, although Axelrod and Bailey (1969) estimated mean annual paleotemperatures for Paleogene and Neogene continental floras.
Bahı´a Magdalena is between lat 24Њ and 25ЊN. , 1991). Keen’s (1971) northern limit (24Њ–25ЊN) of the Panamic molluscan province is used herein. 5ЊN and either 48Њ, 55Њ, or 60ЊN; and the Aleutian molluscan province (cool temperate water mass) is north of the Oregonian molluscan province with its northern boundary at 57Њ, 60Њ, or 62ЊN, according to Zenkevitch (1963), Hall (1964b), Valentine (1966), and Kafanov (1991). Valentine (1966) included a historical review of the naming of molluscan provinces along the west coast of North America.
4) There were different water-circulation patterns in the past that influenced the ancient marine nearshore paleoclimates and regions of shallow and protected marine environments. Present-day molluscan and paleomolluscan provinces The following part of this volume is devoted to the procedure for assigning temperature characteristics to molluscan taxa, faunal communities, and ultimately to marine nearshore paleoclimates. Present-day, shallow-water, marine molluscan provinces along the shelf of California are collections of communities; these communities are collections of populations.