Integrated correlation of Late Silurian (Prídolí s.l.) – Devonian chitinozoans and miospores in the Solimões Basin, northern Brazil

Abstract

Chitinozoans from the Late Silurian (Prídolí s.l.) and Devonian, and miospores from the Middle and Late Devonian, have been investigated from the Solimões Basin in northern Brazil. Of the 37 chitinozoan species encountered, 16 are retained in open nomenclature, because of an insufficient number of well-preserved specimens, and Ramochitina jutaiense is newly described. Three or four miospore zones have been recognized: the LE - LN and VH zones of late to latest Famennian age, and a poorly characterized interval not older than the AP zone of latest Emsian – early Eifelian age. A regional chitinozoan biozonation, consisting of six zones, is proposed for the investigated interval. These zones are, from the oldest to the youngest: concurrent range zone of Ancyrochitina ancyrea and Ancyrochitina aff. A. libyensis (Prídolí s.l.); interval range zone of Angochitina filosa (early Lochkovian); concurrent range zone of Urochitina loboi and Ramochitina jutaiense sp. nov. (late Lochkovian); concurrent range zone of Ancyrochitina arirambaense and Alpenachitina eisenacki (Eifelian s.l. – early Givetian); interval range zone of Angochitina mourai (Frasnian – middle Famennian); and total range zone of Fungochitina ultima (late Famennian).