The ammonoids from the Argiles de Timimoun of Timimoun (Early and Middle Viséan; Gourara, Algeria)

Abstract

Twenty-seven ammonoid species are described from the Argiles de Timimoun of Timimoun (Gourara, Algeria). The following taxa are newly described: <i>Rhnetites</i> n. gen., <i>Rhnetites rhnetensis</i> n. sp., <i>Rhnetites ouladallalensis</i> n. sp., <i>Parahammatocyclus mutaris</i> n. sp., <i>Bollandoceras nitens</i> n. sp., <i>Bollandoceras subangulare</i> n. sp., <i>Bollandoceras politum</i> n. sp., <i>Bollandoceras aridum</i> n. sp., <i>Bollandoceras zuhara</i> n. sp., <i>Bollandoceras mirrih</i> n. sp., <i>Benimehlalites</i> n. gen., <i>Benimehlalites benimehlalensis</i> n. sp., <i>Benimehlalites belkassemensis</i> n. sp., <i>Benimehlalites brinkmanni</i> n. sp., <i>Pachybollandoceras</i> n. gen., <i>Pachybollandoceras intraevolutum</i> n. sp., <i>Pachybollandoceras repens</i> n. sp., Bollanditinae n. subfam., <i>Gourarites</i> n. gen., <i>Gourarites hagaraswad</i> n. sp., <i>Gourarites hagarkarim</i> n. sp., <i>Gourarites mustari</i> n. sp., <i>Gourarites zuhal</i> n. sp., <i>Semibollandites</i> n. gen., <i>Semibollandites kamil</i> n. sp., <i>Semibollandites pauculus</i> n. sp., <i>Semibollandites qawiy</i> n. sp., <i>Timimounia</i> n. gen., <i>Timimounia timimounensis</i> n. sp., <i>Timimounia lunula</i> n. sp., Daaitidae n. fam., <i>Daaites</i> n. gen., <i>Daaites daaensis</i> n. sp., <i>Dimorphoceras lanceolobatum</i> n. sp., <i>Nomismoceras salim</i> n. sp., and <i>Nomismoceras waltoni</i> n. sp. The species occur in three successive horizons and can be attributed to the <i>Bollandites-Bollandoceras</i> Genus Zone (Early and Middle Viséan). They represent the most diverse ammonoid fauna known from this time interval. <br><br> doi:<a href="http://dx.doi.org/10.1002/mmng.200900013" target="_blank">10.1002/mmng.200900013</a>

The ammonoids from the Dalle à <i>Merocanites</i> of Timimoun (Late Tournaisian–Early Viséan; Gourara, Algeria)

“…It was particularly the third occurrence, located 14.5 km west-southwest of Timimoun, which turned out to be very productive for ammonoid faunas; it yielded a large suite of material during the field trips by the present authors. This fauna will be described here for the first time to compliment the monographs of the Early Tournaisian (Ebbighausen et al 2004), early Late Tournaisian (Korn et al 2010c(Korn et al , 2010a, as well as Early and Middle Visan (Bockwinkel et al 2010) assemblages from the Central Sahara of Algeria.…”

“…The co-occurring species Trimorphoceras crassilens n. sp. is very similar in the adult stage, and only well-preserved specimens can clearly be separated when the conch ontogeny is not known ( Familiy Rotopericyclidae Korn, Bockwinkel & Ebbighausen, 2010 For more detailed information about the family, see Korn et al (2010a).…”

“…Included subfamilies. Rotopericyclinae Korn, Bockwinkel & Ebbighausen, 2010 Trimorphoceratinae n. subfam.…”

The ammonoids from the Grès du Kahla supérieur of Timimoun (Middle-early Late Tournaisian; Gourara, Algeria)

“…Stratigraphic section of the Early Carboniferous (Mississippian) rock succession near Timimoun with the position of the assemblages from the Gr s de Kahla suprieur (After Ruzhencev & Bogoslovskaya 1971;Riley 1990;Korn et al 2004. For a description of the faunas from the Ammonellipsites-Merocanites Assemblage and Bollandoceras assemblages, see Ebbighausen et al (2010) and Bockwinkel et al (2010). In the upper of the two shaly intervals, four horizons with ammonoids were discovered, of which the lower three contain a fauna of the Kazakhstania-Acrocanites Assemblage and the upper one belongs to the Pericyclus-Progoniatites Assemblage (Fig.…”

“…3). The faunas of the higher fossiliferous horizons (Dalle Merocanites and Argiles de Teguentour) are described in parallel Bockwinkel et al 2010).…”