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A new Middle–Late Jurassic flora and hot spring chert deposit from the Deseado Massif, Santa Cruz province, Argentina

ALAN CHANNING^*,*, ALBA B. ZAMUNER and ADOLFO ZÚÑIGA

^* School of Earth, Ocean & Planetary Sciences, Cardiff University, Main Building, Park Place, Cardiff, CF10 3YE, UK
Departamento de Paleobotánica, Facultad de Ciencias Naturales y Museo, UNLP, Paseo del Bosque s/n°, 1900 La Plata, Argentina

^* Author for correspondence: channinga{at}cardiff.ac.uk

We present an initial report of a well-preserved and relatively diverse Gondwanan plant assemblage from Bahía Laura Group, Chon Aike Formation strata of the Estancia Flecha Negra area, central-western region of the Deseado Massif, Santa Cruz province, Patagonia, Argentina. The locality contains the first richly fossiliferous chert with a diverse and well-preserved plant assemblage reported from the Mesozoic which is demonstrably associated with hot spring activity. A compression flora and petrified forest contained in associated clastic and volcaniclastic environments provide an indication of regional plant diversity during this as yet poorly represented stratigraphic interval.

Key Words: silicification • sinter • epithermal • permineralized • permineralised • petrified