The Fusselman Formation (Lower and Middle Silurian) of the Franklin Mountains of west Texas and south-central New Mexico

Conference · Wed Apr 01 00:00:00 EST 1992 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:7195539

LeMone, D V ^[1]

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1. Univ. of Texas, El Paso (United States)

The Fusselman Formation of the Franklin Mountains is a massive, vuggy, finely to coarsely crystalline, whitish unit with 185 m stratotype in the north-central part of the range where it forms the main ridge. The formation has been subdivided into three members (in ascending order): Chamberino (80 m), Flag Hill (29 m), and Crazy Cat (76 m). The members may be broadly interpreted as a series of three shoaling-upward sequences with minor karsting reported at the contact between the Chamberino and the Flag Hill members. The formation is dolomitic with the exception of a few limestone ('Hi Cal') lenses in the Crazy Cat Member. The formation rests disconformably on the karsted, low-relief surface of the underlying Cutter Formation of the Late Ordovician Montoya Group. The age of the Fusselman has been determined to be Early-Middle Silurian (Alexandrian-Niagaran) in the Franklins. The Fusselman is overlain by the upper Middle Devonian Canutillo Formation. The disconformity between the underlying uppermost Tippecanoe Fusselman and the overlying basal Kaskaskia Canutillo is on the order of 40 m.y. Extensive karsting developed on the top of Crazy Cat Member and its equivalents on the Tobosa basin ramp during this time. This karsted terrain, where overlain by the proper seal and supplied by an adequate source bed, produces within the Permian basin.

• OSTI ID: 7195539
• Report Number(s): CONF-9204139-; CODEN: AABUD
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 76:4; Conference: American Association of Petroleum Geologists (AAPG) Southwest section meeting, Midland, TX (United States), 21-24 Apr 1992; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

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CAVES
DISSOLUTION
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GEOLOGIC TRAPS
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SILURIAN PERIOD
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