The paper deals with the Upper Cretaceous strata developed in the Sacramento and San Joaquin valleys between the latitude of the town of Corning on the north and the latitude of the Blackwell Corner on the south.

General microfaunal characteristics, stratigraphical sequence, areal distribution, and lithological variations of the foraminiferal zones recognizable in the part of the section are described.

One sketch map shows localities of surface outcrops and wells from which samples were obtained. Another map illustrates in a schematic way stratigraphical sequence and areal distribution of the zones.

End_of_Article - Last_Page 899------------