2001): Brachiopod and fusulinid
assemblages of Kasimovian (Pennsylvanian) age from the Andara Massif (Picos de Europa, northern Spain).
Crinoid, Bivalve, Brachiopod, Fusulinid
, Bryozoanal Calcareous Sandstone Facies (MF9): This facies is 3.
and calcareous algae from Sonora (northwestern Mexico), and their biostratigraphic and palaeobiogeographic implications.
Zone, or the lower part of the Protolonsdaleiastraea juresanensis coral Zone (Figs.
The macrofossils, in particular, fusulinids
, crinoids, bryozoans suggest a shallow marine environment for the limestones.
Such provincialism is very strong among all other stratigraphically important Permian fossil groups, especially fusulinids
The sequence stratigraphic analysis corroborated with fusulinid
biostratigraphy and outcrop data suggests that the deposition of the Amb Formation took place in Transgressive-Regressive (T-R) systems tracts.
The poor preservation of the bryozoans and fusulinid
foraminifera is attributed to the high continental inux during the deposition of the CHF- 2 facies and indicates a proximal middle shelf depositional setting.
and bryozoan colonies (Plate 4C) in the identified microfacies.
As indicated by its fusulinids
(Perez Ramos, 2001), the Paleozoic platform of central and southern Sonora is a large tethysian (gondwanian) unit.
These outcrops are easily accessible and the Upper Permian is formed by a limestone rich in characteristic fossils: ammonoids, fusulinids