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P182 Remarks, LAS TORTUGAS For convenience of record, we apply the name "Las Tortugas" to the baranca about 2 leagues almost due north of Puerto Visser. Hew the series upper Salamanqueano to the Pataganiano is well exposed. At or very near the top of the Banco Verde & immediately beneath the Banco Negro are very local thin lenses of shell breccia, with limited mollusc fauna & numerous shark teeth. In some places these small lenses are almost pure shell limestone, in others nearby are white sand with numerous shells. # 328 is a good representation of the fauna of this unusual bed. The transition from Banco Verde to Banco Negro appears concordant, but may well not be so. The Banco Verde is here clearly marine, although perhaps coastal, the Banco Negro probably terrestrial. The Banco typical green (P185) P183 LAS TORTUGAS 328. Marine shells & shark teeth. Party {profile p184. 3/30/31. 1 pack. 329. Fragments of Miolania. Banco Negro. Party 3/30/31. 1 pack. 330. Selachian coprolites. Banco Verde. Party. 3/30/31. 1 pack. 331. Frags of crustaceans. Banco Verde. G.F.S. 3/30/31. 1 pack. VARIOUS LOCALITIES 332. Misc. shark teeth, shells, & odds & ends from Patagoniano (mostly on surface). Both sides of pampa approx. in latitude of Cubega Blanca and Lomas Blancas. Party. Various dates. 1 pack.