Comments to range charts. Palynomorphs Jurassic Taxa Ranges and Correlation Charts for the Circum Pacific. 3. South America and Antarctic Peninsula

VOLKHEIMER, W., QUATTROCCHIO, M.E. & ZAVATTIERI, A.M.

NEWSLETTERS ON STRATIGRAPHY

GEBRUDER BORNTRAEGER

Lugar: Stuttgart; Año: 1990 vol. 21 p. 81 - 85

0078-0421

As the editors have pointed out in the Introduction to Part 3, the marine Lower Jurassic is present along the Pacific margin of South America, from Argentina and Chile to Colombia (GEYER 1980; RICCARDI 1983; PALACIOS 1985). However, most information provided in the Lower Jurassic range charts is based on material from Argentina. Systematics and stratigraphic ranges of the palynomorphs, megaflora, foraminifers, ostracods, bivalves and brachiopods, are mainly based on stratigraphic sections exposed in west-central Argentina. According to information provided by Z. GASPARINI for this paper, there are several poorly known records of Early Jurassic vertebrates (HUENE 1927; CHONG & GASPARINI 1972, 1976; GASPARINI 1976, 1979, 1981, 1985). The ammonite range charts, on the other hand, are based mainly on sections in northern Chile, although the same faunas are also present in other areas, and Hettangian and Sinemurian faunas have also been described from Perú, Colombia, and, most recently (RICCARDI et al. 1988), Argentina. In Antarctica Late Sinemurian ammonites have been described from central Alexander Island (THOMSON & TRANTER 1986).