%0 Book Section
%T Late Bajocian bioevents of ammonoid immigration and colonization in the Arequipa Basin (Pumani River area, Ayacucho, southern Peru).
publisher Instituto Geológico Minero y Metalúrgico
%D 2013
%@ https://hdl.handle.net/20.500.14352/35672
%X Strata of the Socosani Formation in the Pucayacu andPumani sections (Ayacucho Department, Peru), alongseveral kilometres, have yielded Upper Bajocianammonoid fossil-assemblages characterized by theoccurrence of juvenile individuals belonging to endemic orpandemic taxa, such as Megasphaeroceras andSpiroceras respectively. In addition, certain Bajocian taxarelatively common in the Mediterranean-CaucasianSubrealm, but very scarce in the Eastern PacificSubrealm, such as the strigoceratid Cadomoceras and thephylloceratid Adabofoloceras, occur in this area. TheseLate Bajocian bioevents of regional appearance ofimmigrant ammonoids and even sustained colonizationshould be associated with an episode of maximumdeepening, maximum relative sea-level rise and highestoceanic accessibility of a Bajocian-Bathoniandeepening/shallowing palaeoenvironmental cycle in theArequipa Basin, during the Late Bajocian NiortenseBiochron.
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