Lower and middle jurassic calcareous nanno fossils from portugal

Hamilton, G.

Eclogae Geologicae Helvetiae 72(1): 1-18

1979


Accession: 005835006

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Abstract
Stratigraphic distribution of 41 calcareous nannofossils in 24 samples from a Lower Jurassic section at Peniche and in 99 samples from 2 Middle Jurassic sections at Brenha and Cap Mondego is given. Biostratigraphic significance of the assemblages is discussed with reference to existing calcareous nannofossil zonal schemes and 2 new zones embracing Toarcian and Bajocian stages are proposed.