INVESTIGADORES
ORTEGA Gladys Del Carmen
artículos
Título:
Ordovician and Silurian graptolites assemblages from Cerro del Fuerte, San Juan Province, Argentine
Autor/es:
RICKARDS, B.; TORO, B.A.; BRUSSA, E.D.; ORTEGA, G.
Revista:
GEOLOGICAL JOURNAL (CHICHESTER)
Editorial:
JOHN WILEY & SONS LTD
Referencias:
Lugar: LOndres; Año: 1996 vol. 31 p. 101 - 122
ISSN:
0072-1050
Resumen:
A description is given of three transects through the Silurian strata of Cerro del Fuerte, San Juan Province, Argentina.All are in the Precordillera structural belt; the Silurian strata probably have conformable boundaries with theOrdovician and Devonian, and there is a regional angular unconformity at the base of the Carboniferous. The Silurianincludes two formations, the La Chilca below and the Los Espejos above. Both formations exhibit a coarseningupwards sequence: the Los Espejos Formation spans the Wenlock, Ludlow and, probably, Piidoli epochs, the firstbeing of relatively fine sediments and the latter two of coarser sediments. The third transect also includes Devoniansediments which seem to represent, albeit incompletely, a third coarsening upwards cycle. The graptolite faunas havebeen extensively collected and form the basis of the systematic section of the paper. Late Ordovician, Llandovery andLudlow faunas are described.
