Biblioteca - Ingemmet

Vista normal Vista MARC Vista ISBD

Schaltegger, Urs

U-Pb zircon age determinations on volcanic ash beds in the Pucara Formation (Utcubamba Valley): a precise age for the Triassic-Jurassic and the Hettangian-Sinemurian boundaries - Lima Sociedad Geológica del Perú 2008 - 6 p. ilus.

Subjects--Topical Terms:
BIOESTRATIGRAFIA
CENIZA VOLCANICA
DATACION U-PB
EXTINCION MASIVA
HETANGIANO
JURASICO
LIMITE ESTRATIGRAFICO
PALEOCLIMATOLOGIA
ROCAS VOLCANICAS
TRIASICO
VOLCANISMO

Subjects--Geographic Terms:
AMAZONAS
CHACHAPOYAS
PERU
UTCUBAMBA

Subjects--Index Terms: GRUPO PUCARA