3. South America and Antarctic Peninsula - 3.3 Upper Jurassic of South America and Antarctic Peninsula
Riccardi, A. C.; Leanza, H. A.; Volkheimer, W.
Newsletters on Stratigraphy Volume 21 Number 2 (1990), p. 129 - 147
published: Jan 1, 1990
ArtNo. ESP026002102006, Price: 29.00 €
Most of the Oxfordian and Kimmeridgian exposed along the Pacific margin of South America consists of volcanic and continental rocks (Riccardi & Rolleri 1980; Riccardi 1983; Palacios 1985; Mojica & Dorado 1987). Marine Oxfordian is represented by regressive facies, mostly restricted to west-central Argentina and central and northern Chile. Marine Kimmeridgian has been documented in a few localities of northern Chile (Förster & Hillebrandt 1984), southern Patagonia (Feruglio, 1936-7; Leanza 1968; Fuenzalida & Covacevich 1988), and (?) southern Perú (Vicente 1981). Marine Tithonian, on the other hand, is widely developed, in total or part, from (?) Patagonia to Colombia, as well as in Antarctica. Our knowledge of the systematics and stratigraphic ranges of the South American Malm fossils remain uneven. The best known fossil group, the ammonites, has been studied in depth only from the Tithonian strata exposed widely in west-central Argentina. Other important invertebrate groups, like the bivalves, with species ranges usually starting in the Middle Jurassic or extending into the Cretaceous, have commonly been studied on the basis of the more abundant Dogger or Neocomian material. The bivalve range chart is restricted to the trigoniids, i.e. the only group that has been revised in the last years. Other bivalve taxa are known from single records which cannot be used for biostratigraphy. Important advances in the study of palynomorph assemblages have also been added in recent years, based exclusively on material from west-central Argentina.