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This bed rested on one with bones of an extinct rodent, namely, the Megamys Patagoniensis; and this again on another with extinct marine shells. The species found by M. d'Orbigny in different parts of this formation consist of: Ostrea Patagonica, d'Orbigny, "Voyage, Pal." Ostrea Ferrarisi, d'Orbigny, "Voyage, Pal." 3. Ostrea Alvarezii, d'Orbigny, "Voyage, Pal."
Pecten Patagoniensis, d'Orbigny, "Voyage, Pal." 5. Venus Munsterii, d'Orbigny, "Voyage, Pal." Arca Bonplandiana, d'Orbigny, "Voyage, Pal." According to M. d'Orbigny, the sandstone extends westward along the coast as far as Port S. Antonio, and up the R. Negro far into the interior: northward I traced it to the southern side of the Rio Colorado, where it forms a low denuded plain.
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