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Ameghiniana

versión On-line ISSN 1851-8044

Resumen

PASSALIA, Mauro G.. New records of the cretaceous flora described by Halle (1913) from San Martín Lake, Santa Cruz, Argentina. Ameghiniana [online]. 2007, vol.44, n.3, pp. 565-595. ISSN 1851-8044.

Two new sites with Cretaceous fossil plants, Bajo Comisión 1 and 2, have been studied. They are located north of San Martín Lake, Santa Cruz Province, Argentina, and their deposits belong to the Kachaike Formation (Late Albian - Cenomanian). This area was previously studied by Thor Halle who provided the description of a fossil plant assemblage. About twenty species have been recognized at the new sites, mostly belonging to pteridophytes, pteridosperms, conifers as well as morphogenera of uncertain botanical affinity. Bryophytes, bennettites, ginkgophytes and angiosperms are also present as subordinated components. Among them, new taxa are described: Pachypteris auriculata sp. nov., Brachyphyllum kachaikensis sp. nov. and Thorhallenia dentata gen. et sp. nov. In turn, two species, previously described by Halle, have been reassigned to other genera or species: Phyllopteroides cf. P. laevis Cantrill and Webb instead of Asplenites lanceolatus Halle, and Gleichenites juliensis Herbst instead of Gleichenites cf. G. micromerus Heer and Phyllopteroides cf. P. laevis Cantrill y Webb instead of Asplenites lanceolatus Halle. There is a considerable resemblance between Bajo Comisión 1 and 2 assemblages and the flora previously described by Halle, suggesting they belong to the same levels.

Palabras llave : Argentina; Santa Cruz; Kachaike Formation; Cretaceous; Pteridophytes; Gymnosperms; Angiosperms.

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