Pg. 241, 242 (fig. 1), 243. Clovelly stage. A stage name, based on faunal assemblages occurring in sediments commonly termed "Lower" Miocene in subsurface of southeastern Louisiana. Applied to sediments occurring between top of DISCORBIS B zone or ROBULUS CHAMBERSI zone, and top of DISCORBIS restricted. Generally, best foraminiferal markers for this stage are (descending) DISCORBIS (B) BOLIVARENSIS, ROBULUS CHAMBERSI, MARGINULINA (11) ASCENSIONENSIS, and SIPHONINA DAVISI. Duck Lake and Napoleonville stages proposed as replacements for "Middle" and "Upper" Miocene respectively. Names were selected arbitrarily only because denoted fields demonstrate representative sections for each; nothing in way of principal producing horizons is implied.
Named from Clovelly field, LaFourche Parish, southeastern LA.

Source: Publication; US geologic names lexicon (USGS Bull. 1200, p. 847).

Pg. 412-416. Clovelly stage. All sediments in the coastal province that can be shown to be contemporaneous with type section in Clovelly field, LaFourche Parish, Louisiana, or its equivalents. Characterized by assemblage zone containing the following foraminiferal species or equivalents (citing Akers and Drooger, 1957, AAPG Bull., v. 41, no. 4, p. 658-768; McLean, 1957): EGGERELLA, SPRIOPLECTAMMINA BARROWI, BUCCELLA MANSFIELDI, BIGENERINA sp. or AMPHISTEGINA sp.

Source: Publication.

Clovelly Stage of Murray (1961) can only be applied to strata in very narrow belts within the Gulf of Mexico due to problems presented by the temporal and spatial stratigraphic distribution of the characteristic benthonic neritic species. Author proposes his own subdivisions of the Miocene (divisions J to A, ascending), based on established biostratigraphic (benthic forams) correlations of regional transgressive marine units. Clovelly Stage of Murray (1961) = (ascending) divisions B and A of author (BUCCELLA MANSFIELDI zone to top of BIGENERINA cf. FLORIDANA zone).

Source: Publication; LA State Geol. Survey (written commun., Mar. 2007).

In some reports discussing Miocene sediments in the subsurface of southern Louisiana, the names Clovelly Formation, Duck Lake Formation (a name applied by Doering, 1958, to a Pleistocene subsurface unit in same area) and Napoleonville Formation have been misapplied to the biostratigraphically-defined Clovelly Stage, Duck Lake Stage, and Napoleonville Stage of McLean (1957).

Source: Louisiana State Geol. Survey (written commun., Mar. 2007).