Cooke, C. W. 1949b. Two Cretaceous Echinoids from Peru. Journal of Paleontology 23, 84-86.
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Cooke, C. W.
1949
Two Cretaceous Echinoids from Peru
Journal of Paleontology
23: 84-86
Publication
from Kier & Lawson (1978)
Two new species of echinoids from the Ayavacas limestone member of the Moho formation in the Lake Titicaca region, Peru, are described, and it is suggested that the age of the Ayavacas limestone may be younger than Aptian (Cretaceous).