Coral Reefs; Volcanic Islands; South American Geology — Complete

by Charles Darwin

Coquimbo.

In the same bed, Rio Claro:
Pecten Dufreynoyi.
Ostrea hemispherica.
Terebratula ænigma.
Spirifer linguiferoides.

Same bed, near Arqueros:
Hippurites Chilensis.
Gryphæa orientalis.

Collected by M. Domeyko from the same locality, apparently near Arqueros:
Terebratula ænigma and Terebratula ignaciana, in same block of limestone.
Pecten Dufreynoyi.
Ostrea hemispherica.
Hippurites Chilensis.
Turritella Andii.
Nautilus Domeykus.

Guasco.

In a collection from the Cordillera, given me: the specimens all in the same condition:
Pecten Dufreynoyi.
Turritella Andii.
Terebratula ignaciana.
Terebratula ænigma, var.
Spirifer Chilensis.

Copiapo.

Mingled together in alternating beds in the main valley of Copiapo near Las Amolanas, and likewise higher up the valley:
Pecten Dufreynoyi.
Turritella Andii.
Terebratula ænigma, var., as at Guasco.
Astarte Darwinii.
Gryphæa Darwinii.
Gryphæa nov. species?
Perna Americana.
Avicula, nov. species.

Main valley of Copiapo, apparently same formation with that of Amolanas:
Terebratula ænigma (true).

In the same bed, high up the great lateral valley of the Despoblado, in the ravine of Maricongo:
Terebratula ænigma (true).
Pecten Dufreynoyi.
Gryphæa Darwinii?