Matches in SemOpenAlex for { <https://semopenalex.org/work/W1987297243> ?p ?o ?g. }
- W1987297243 endingPage "400" @default.
- W1987297243 startingPage "381" @default.
- W1987297243 abstract "Abstract Early Paleogene mammals are rare in Africa. They are mainly found in the northwestern part of the continent. Nearshore marine deposits from the Ouarzazate basin, in the southern rim of the Central High Atlas (Morocco), have yielded diverse Thanetian and Ypresian selachian and mammalian faunas [Cappetta et al., 1978, 1987; Gheerbrant et al., 1993]. These faunas from the Paleocene/Eocene transition document the oldest known placental mammals of Africa [Gheerbrant, 1992, 1994, 1995; Gheerbrant et al., 1998; Sigé et al., 1990; Sudre et al., 1993]. New field work in the central part of the basin, near El-Kelaâ M’Gouna, has led to the discovery of a new locality with continental and marine remains, including some non-determinable ostracods and charophytes plus planktonic and benthic foraminifera. The tests of the planktonic foraminifera were globally poorly preserved and highly re-crystallized. However, we found Globigerapsis index (dominant in the sample), Globigerapsis aff. kugleri, Subbotina frontosa, Subbotina inaequispira, Acarinina bullbrooki, Acarinina aff. pentacamerata, Morozovella aragonensis, Morozovella caucasica, Morozovella crater and Pseudohastigerina sp. Following Berggren et al. [1995], the lowest occurrence of the genus Globigerapsis denotes the P10/P11 zonal boundary and the highest occurrence of M. aragonensis denotes the P11/P12 zonal boundary. Both these taxa were represented by several relatively well-preserved specimens. Then, we consider that the sample is correlative to the planktonic foraminiferal Zone P11, for which a biochronal equivalent has been dated between 45.8 and 43.6 Ma. Consequently, the middle Lutetian Aznag locality represents the only known Eocene mammalian site to be adequately dated in Africa. The selachian fauna is relatively rich with nearly 30 species, many of them being probably new. The genera Squatiscyllium, Protoginglymostoma, Ouledia and Garabatis are confidently identified; these taxa were unknown in the Lutetian. We mention the first occurrence in the Eocene of Morocco of « septentrional » taxa Protoginglymostoma, Hemiscyllium and Rhinobatos bruxelliensis and we confirm the presence of genera Eomobula and Rhynchobatus. These data suggest significant North to South faunal exchanges, that contrast with the South to North tendency observed during the early Eocene [Noubhani and Cappetta, 1997]. Nevertheless, the selachian fauna from Aznag is clearly tropical with the occurrence of endemic taxa only known from Morocco (Garabatis, Orectolobiformes nov. gen.) and from the equatorial Tethys-Central Atlantic (Chiloscyllium aff. meraense, Ginglymostoma aff. angolense, Squatiscyllium, « Dasyatis » aff. sudrei, Ouledia, Arechia, Odontorhytis). Only 15 mammalian teeth have been recovered, most of them are very fragmentary and of small size; they document at least 7 species. A probable soricomorph “insectivore” documented by a complete lower molar is very atypical by its tiny size and the entoconid and hypoconulid poorly differentiated from the postcristid. Another “insectivore” is documented by a trigonid of p4, it is reminiscent to the zalambdodont groups. An incisor of rodent shows an enamel microstructure with uniserial Hunter-Schreger bands ; this structure is observed in several Eocene rodents from Eurasia and could be related to the pauciserial to uniserial transition observed in Zegdoumys sebtlai from Chambi (early Eocene, Tunisia) [Martin, 1999]. An upper molar of chiropteran cannot be assigned to one of the known microchiropteran superfamilies; the species from Aznag is characterized by derived traits (e.g. crestiform protocone, hypocone present) and primitive ones such as the presence of a paraconule which evokes the “eochiropteran” grade and the primitive vespertilionoids (paleochiropterygids). A small primate is documented by two fragmentary lower molars and characterized by a well-marked bunodonty and a large paraconid ; this form differs from contemporaneous anthropoids but is very similar to Altiatlasius from the Thanetian of the Adrar Mgorn 1. Two “condylarths” evoke European taxa; a M3 is tentatively assigned to the genus Paschatherium and a DP3or4 is reminiscent to that of Microhyus. This specimen shows also affinities with the ?DP4 of Chambius, a primitive macroscelidid from Chambi. The presence of these mammals strengthen the hypothesis of faunal exchanges between Africa and Europe during the early Eocene. During the middle Eocene, in the south of the Central High Atlas, palynologic data suggested a fairly dry, scarcely vegetated hinterland, and a tropical coastal vegetation (mangrove swamp and salt-marsh) [Fechner, 1988]. The mammals of Aznag, which are characteristic of a closed environment (chiropterans, primate, small ungulates), were certainly confined to a thin belt of coastal vegetation (forest gallery). The fossiliferous level is characterized by a cyclicity of the deposits which could suggest a seasonal variation. Among the selacians, the abundance of the batoids, the absence of both macrofauna and deep-water selacians, and the fragmentary elements indicate hydrodynamical transport in a shallow channel or delta." @default.
- W1987297243 created "2016-06-24" @default.
- W1987297243 creator A5015950141 @default.
- W1987297243 creator A5029300869 @default.
- W1987297243 creator A5053799784 @default.
- W1987297243 creator A5082087486 @default.
- W1987297243 creator A5085118828 @default.
- W1987297243 date "2005-07-01" @default.
- W1987297243 modified "2023-10-17" @default.
- W1987297243 title "Aznag (Ouarzazate basin, Morocco), a new African middle Eocene (Lutetian) vertebrate-bearing locality with selachians and mammals" @default.
- W1987297243 cites W140035202 @default.
- W1987297243 cites W1569702596 @default.
- W1987297243 cites W1653004058 @default.
- W1987297243 cites W1663139579 @default.
- W1987297243 cites W1799003920 @default.
- W1987297243 cites W1968051024 @default.
- W1987297243 cites W1976638932 @default.
- W1987297243 cites W1986237338 @default.
- W1987297243 cites W2003181981 @default.
- W1987297243 cites W2003747784 @default.
- W1987297243 cites W2006122948 @default.
- W1987297243 cites W2012634367 @default.
- W1987297243 cites W2025272177 @default.
- W1987297243 cites W2036371595 @default.
- W1987297243 cites W2040598947 @default.
- W1987297243 cites W2045723241 @default.
- W1987297243 cites W2061015168 @default.
- W1987297243 cites W2079540506 @default.
- W1987297243 cites W2089168400 @default.
- W1987297243 cites W2091021333 @default.
- W1987297243 cites W2125617682 @default.
- W1987297243 cites W2130950244 @default.
- W1987297243 cites W2179237927 @default.
- W1987297243 cites W2314212432 @default.
- W1987297243 cites W2496098234 @default.
- W1987297243 cites W2511221698 @default.
- W1987297243 cites W25859090 @default.
- W1987297243 cites W2586159977 @default.
- W1987297243 cites W2605439167 @default.
- W1987297243 cites W2606300859 @default.
- W1987297243 cites W2606565070 @default.
- W1987297243 cites W2610053968 @default.
- W1987297243 cites W2794019471 @default.
- W1987297243 cites W2988517855 @default.
- W1987297243 cites W367175617 @default.
- W1987297243 cites W53998004 @default.
- W1987297243 cites W561158876 @default.
- W1987297243 cites W561286203 @default.
- W1987297243 cites W56178198 @default.
- W1987297243 cites W567611320 @default.
- W1987297243 cites W970078 @default.
- W1987297243 cites W2080949841 @default.
- W1987297243 cites W2314714706 @default.
- W1987297243 cites W2471954378 @default.
- W1987297243 cites W2472333009 @default.
- W1987297243 cites W2473687189 @default.
- W1987297243 cites W2474772166 @default.
- W1987297243 cites W2488671329 @default.
- W1987297243 cites W2522569969 @default.
- W1987297243 cites W2523797179 @default.
- W1987297243 cites W2525957105 @default.
- W1987297243 cites W2526511772 @default.
- W1987297243 cites W2778466541 @default.
- W1987297243 doi "https://doi.org/10.2113/176.4.381" @default.
- W1987297243 hasPublicationYear "2005" @default.
- W1987297243 type Work @default.
- W1987297243 sameAs 1987297243 @default.
- W1987297243 citedByCount "40" @default.
- W1987297243 countsByYear W19872972432012 @default.
- W1987297243 countsByYear W19872972432013 @default.
- W1987297243 countsByYear W19872972432014 @default.
- W1987297243 countsByYear W19872972432015 @default.
- W1987297243 countsByYear W19872972432016 @default.
- W1987297243 countsByYear W19872972432019 @default.
- W1987297243 countsByYear W19872972432020 @default.
- W1987297243 countsByYear W19872972432021 @default.
- W1987297243 countsByYear W19872972432022 @default.
- W1987297243 crossrefType "journal-article" @default.
- W1987297243 hasAuthorship W1987297243A5015950141 @default.
- W1987297243 hasAuthorship W1987297243A5029300869 @default.
- W1987297243 hasAuthorship W1987297243A5053799784 @default.
- W1987297243 hasAuthorship W1987297243A5082087486 @default.
- W1987297243 hasAuthorship W1987297243A5085118828 @default.
- W1987297243 hasConcept C108469399 @default.
- W1987297243 hasConcept C109007969 @default.
- W1987297243 hasConcept C111368507 @default.
- W1987297243 hasConcept C125471540 @default.
- W1987297243 hasConcept C127313418 @default.
- W1987297243 hasConcept C151730666 @default.
- W1987297243 hasConcept C157369684 @default.
- W1987297243 hasConcept C18903297 @default.
- W1987297243 hasConcept C204330871 @default.
- W1987297243 hasConcept C2777461261 @default.
- W1987297243 hasConcept C2780368712 @default.
- W1987297243 hasConcept C61721801 @default.
- W1987297243 hasConcept C71640776 @default.
- W1987297243 hasConcept C73707237 @default.
- W1987297243 hasConcept C83042747 @default.