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The Humble Oil and Refining Company, H. J. Ellender No. 1, sec. 32, T. 19 S., R. 19 E., Lirette field, Terrebonne Parish, Louisiana, is the type locality for Bigenerina nodosaria directa, Cibicides carstensi, Uvigerina lirettensis, Globorotalia fohsi fohsi, and Globorotalia mayeri, stratigraphically important Miocene marker species described by Cushman and Ellisor (1939). Globorotalia fohsi fohsi, ranging from the Cibicides carstensi opima zone upward through the Bigenerina humblei zone, has been used extensively for intercontinental correlation of Miocene deposits.

Ellisor (1940) reported Bigenerina humblei, Uvigerina lirettensis, and Globorotalia fohsi fohsi at 9,612 feet, the sample depth from which she and Cushman had earlier described Globorotalia fohsi fohsi and Globorotalia mayeri. Additional deeper drilling and later work has proved that the Humble Ellender No. 1 well penetrated sediments no older than Bigenerina nodosaria directa-Cibicides carstensi and that the deepest well in Lirette field, the Humble H. J. Ellender No. 6 (also located in sec. 32), drilled to 13,500 feet, did not encounter the Textularia stapperi zone which overlies the Bigenerina humblei zone.

In order to establish that Bigenerina humblei could not have occurred at 9,612 feet in Lirette field , and that the Humble Ellender No. 1 well should not be considered a valid type locality for Globorotalia fohsi fohsi and Globorotalia mayeri, two cross sections have been constructed; A-A^prime from Raceland field, Lafourche Parish, to Bay Baptiste field, Terrebonne Parish, and B-B^prime from Patterson field, St. Mary Parish, to Lirette field. The two sections depict the general downdip (coastward) thickening of the Miocene section and the tremendous sedimentary accumulations encountered on the downthrown sides of the large "growth" or depositional faults typical of the area.

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