Middle Pennsylvanian Keeler Canyon Formation

Inyo County, California

The green arrows point to natural cross-sections of fusulinids, whose distinctive, geometrically ornate living chambers were secreted by an extinct single-celled animal; smaller fusulind at left is Wedekindelina sp. Larger specimen at right is Fusulinella sp.; from the Middle Pennsylvanian Keeler Canyon Formation, Inyo County, California.

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