An early Eocene pharetronid sponge from the Bateque Formation, Baja California Sur, Mexico

Squires, Richard L.; Demetrion, Robert A.

doi:10.1017/s0022336000019661

Cited by 14 publications

(6 citation statements)

References 2 publications

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“…Tertiary sponges are very poorly k n o h , particularly in the Lower Tertiary, and have never been previously reported as reef builders. Documented Lower Tertiary occurrences include assemblages from North Carolina (Rigby 1981), Baja California Sur (Squires & Demetrion 1989), and India (Rigby & Mohanti 1990), all of Eocene age. Spicules and 'spiculites' are not uncommon in several areas (Nachev & Nachev 1989;Kuss & Leppig 1989).…”

Section: Conclusion: the Salt Mountain Limestone And The Post-cretacementioning

confidence: 99%

A Paleocene coral—algal—sponge reef from southwestern Alabama and the ecology of Early Tertiary reefs

Bryan

1991

LET

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The Late Paleocene Salt Mountain Limestone from southwestern Alabama is a coral‐algal‐sponge buildup which further characterizes the faunal makeup of early post‐Cretaceous reefs. Thin sectioning has disclosed a variety of lithologies, including large foram‐algal packstone, algal bindstone, and sponge bafflestone. A low‐diversity fauna of massive scleractinian corals caps the sequence, but may be developed intermittently throughout the section as well. The constructional importance of coralline algae and the low diversity of scleractinian corals are characteristic of Paleocene reefs in general. Sponges, however, are virtually unknown in earliest Tertiary sediments. Their abundance in the Salt Mountain demonstrates not only their local contribution to Early Tertiary reefs, but may also reflect an opportunistic response of sponges as reef constructors following the extinction of oligotrophic, rudist‐coral reef communities of the Late Cretaceous. □Paleocene, reef, paleoecology, sponges, extinction.

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Section: Conclusion: the Salt Mountain Limestone And The Post-cretacementioning

confidence: 99%

A Paleocene coral—algal—sponge reef from southwestern Alabama and the ecology of Early Tertiary reefs

Bryan

1991

LET

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“…However, an important index fossil found in the Adjuntas Formation is Venericardia planicosta (Figure 5.26 (Figure 4.18 -4.20), shells of which were used to obtain an isotopic age equivalent to 52 Ma (Perrilliat et al, 2006), which corresponds with the Ypresian stage (Steurbaut, 2006). A nautiloid specimen reported by Squires and Demetrion (1992) from the Eocene of Baja California Sur, was reported as being similar to H. peruviana.…”

Section: Biostratigraphymentioning

confidence: 90%

Eocene strata from the Sabinas Basin and their bearing in sedimentary basin correlation in NE Mexico

Vega

Perrilliat

Duarte-Torres³

et al. 2007

BSGM

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The El Arco section, located on the southeast margin of the Sabinas Basin (Adjuntas Sub-basin), includes a succession consisting of Upper Cretaceous formations typical for this unit, as well as Paleogene strata similar to those previously reported from the La Popa Basin, adjacent to the Sabinas Basin. The El Arco carbonate lentil includes microfossils and nautiloids that indicate a middle Eocene age, which is consistent with previous stratigraphic inferences for the La Popa Basin. The presence of the nautiloid Hercoglossa sp. cf. H. peruviana in the El Arco Lentil and in the upper portion of the Rancho Nuevo Formation of Parras Basin, suggests a new correlation scheme for the Tertiary stratigraphic units of the three basins (Parras, La Popa and Sabinas basins). All three units had sediment input as late as middle Eocene time.

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“…At USGS 84TC51 locality the exposed lithology consists mostly of very f i n e s a n d s t o n e w i t h interbedding fossiliferous lenses, locally rich in well preserved stromatolites, coralline algae, foraminifers, calcareous sponges, gastropods, and bivalves (Squires & Demetrion, 1989, 1990a. No deep-water ostracods were found and t h e assemblage is d o m i n a t e d by thick-shelled Trachyleberdidae (Bajacythere, Occultocythereis, Jugosocythereis), suggesting an outer-neritic environment.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, Squires & Demetrion (1989, 1990a,1990b, based on the presence of Morozovella aragoizensis (Nuttall) and M. caucasica (Glaessner), gave a later early Eocene age to a locality closely situated to the IGM-2,515-UNAM locality and, based on the calcareous nannofossils content, a mid Eocene age (Discoaster bifax -CP14a Zone of Okada & Bukry, 1980) to locality USGS-84TC51. The ostracodes recovered at locality IGM-2,515-UNAM a r e associated with very a b u n d a n t Pseudopliragmiiia (Proporocyclina) flintensis (Cushman) and Awzphistegiria lopeztrigoi (Palmer), suggesting a mid Eocene age (Butterlin, 1981).…”

Section: Biostratigraphic Frameworkmentioning

confidence: 99%

Middle Eocene Ostracoda from Baja California Sur, Mexico

Carreño

Cronin

1993

J. Micropalaeontol.

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One genus and six new species of ostracodes are described from the Bateque Formation on the Pacific Coast of Baja California Sur, Mexico. Planktonic foraminifers indicate a mid Eocene age and the whole assemblage is characteristic of a shallow warm-water environment. Paijenborchella rnezquitalensis sp. nov. is the second record of the genus Puijenborchella from the Eocene of North America. Except for this species and the new genus Bujacythere, the ostracode association has strong affinities with those described from the lower Tertiary Gulf Coast region. 1. Micropalaeontol. 12 (2): 141-153, December 1993.

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An early Eocene pharetronid sponge from the Bateque Formation, Baja California Sur, Mexico

Cited by 14 publications

References 2 publications

A Paleocene coral—algal—sponge reef from southwestern Alabama and the ecology of Early Tertiary reefs

A Paleocene coral—algal—sponge reef from southwestern Alabama and the ecology of Early Tertiary reefs

Eocene strata from the Sabinas Basin and their bearing in sedimentary basin correlation in NE Mexico

Middle Eocene Ostracoda from Baja California Sur, Mexico

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