CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina esnaensis Le Roy 1953
This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.
Citation: Globigerina esnaensis Le Roy 1953Rank: SpeciesType specimens: no. 58002.Type sample (& lithostrat): base of the Esna formation, base of the Loxostomum applinae zonule; in soft, fissile, dark green to grayish green foraminiferal shale. Common throughout the Esna shale, but best in the lower two-thirds.Type age (chronostrat): Probably Lower Eocene but possibly PaleoceneType locality: The Maqfi section, in a conspicuous escarpment 53 km. west and 37 km. north from the intersection of long. 29° E. and lat. 27° N., 69 km. N. 65° E. of the village of Qasr Farafra in the Farafra Oasis, and 400 km. S. 41° W. of Cairo, EgyptType repository: USNM;
Original Description Test roughly quadrate in ventral view, low trochoid spiral, flattened dorsally, umbilicate ventrally; chambers inflated, usually four in last whorl, rarely five, gradually increasing in size as added, last one rather strongly inflated; sutures distinct, strongly depressed on ventral side; periphery broadly rounded, lobulate; wall roughened with minute nodes; aperture rather large, arched, at base of last chamber. Size: Diameter 0.50-0.64 mm.; thickness 0.39 mm. Extra details from original publication This specjes may be identified by its quadrate outline and by the strongly inflated last chamber. The form differs from Globigerina quadrata White described from the Upper Cretaceous of Mexico by exhibiting more inflation of the last chamber, by having a roughened wall, and by showing a larger ventral umbilical depression. Some workers would probably assign this form to Globorotalia crassa (Cushman) var. densa (Cushman)
References:
Berggren, W. A., Pearson, P. N., Huber, B. T. & Wade, B. S. (2006b). Taxonomy, biostratigraphy, and phylogeny of Eocene Acarinina. In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 9): 257-326. gsVO
LeRoy, L. W. (1953). Biostratigraphy of the Maqfi Section, Egypt. Geological Society of America, Memoir. 54: 1-73. gs
Globigerina esnaensis compiled by the pforams@mikrotax project teamviewed: 29-5-2023
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