Ball coals from Alto Chicama (Peru)

Ireneusz Lipiarski, Ryszard Szymoniak


Węgle kuliste z Alto Chicama (Peru)

Ball coals from Alto Chicama occur in coal seams of the Chimu Formation (Lower Cretaceous). They are ellipsoidal, spheroidal of cylindrical in shape and have a smooth, lustrous surface. Their size varies from a few to 40 cm. They have been found in a tectonically disturbed area where intrusive rocks have noted.

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