Discusses microscopic examination of rock specimens taken from Pampas deposit and from Chilean tuff. Says he finds organic remains only in the tuff.
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Discusses microscopic examination of rock specimens taken from Pampas deposit and from Chilean tuff. Says he finds organic remains only in the tuff.
Thanks WBC for offer to examine specimen and for offer of slices of shells, but has no achromatic microscope.
Asks WBC if he will examine a specimen of calcareous rock.
Is obliged for the account of the structure of the Pampas specimen and its difference from specimens of the modern calcareous bed of Coquimbo in Chile. If he thinks that J. S. Bowerbank can make out the nature of the specimens, they should be shown to him.