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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."
The shells included in these beds have been named for me by M. d'Orbigny: they consist of: Ostrea Patagonica, d'Orbigny, "Voyage" Part. Pal. 2. Ostrea Alvarezii, d'Orbigny, "Voyage" Part. Pal. 3. Pecten Paranensis, d'Orbigny, "Voyage" Part. Pal. 4. Pecten Darwinianus, d'Orbigny, "Voyage" Part. Pal. 5. Venus Munsterii, d'Orbigny, "Voyage" Pal. 6. Arca Bonplandiana, d'Orbigny, "Voyage" Pal. 7.
Ostrea Patagonica, d'Orbigny, "Voyage, Pal." Ostrea Alvarezii, d'Orbigny, "Voyage, Pal." Pecten Paranensis, d'Orbigny, "Voyage, Pal." Pecten Darwinianus, d'Orbigny, "Voyage, Pal." Pecten actinodes, G.B. Sowerby. 6. Casts of a Turritella. The four first of these species occur at St. Fe in Entre Rios, and the two first in the sandstone of the Rio Negro.
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