The study of a rich Middle Oxfordian arnrnonite succession from Kachchh CW India) supplies new evidence to support the open biogeographic connections between Submediterranean and lndo - East-African Provinces. studied assemblage is precisely dated as Upper Transversarium Zone, (Middle Oxfordian), on basis representatives Perisphinctes Larche­ria , this finding being first record West-Europe...

Correlation of Lower Cambrian rocks is hampered because there are no widespread and rapidly evolving organisms such as the later agnostids, graptolites, conodonts, ammonites, or planktonic foramini fers, that might provide basis for a consistent intercontinental biostratigraphy. Four problems illustrate issue: 1) age oldest trilobites China; 2) acritarch correlations between Siberia Baltica; 3)...