|mhorn||Дата: Saturday, 28.07.2012, 11:09 | Сообщение # 1|
|Villaseñor A.B., Olóriz F., Palomino I.L., López-Caballero I. (2012) Updated ammonite biostratigraphy from Upper Jurassic deposits in Mexico // Revue de Paléobiologie, Vol. spéc. 11. P.249-267. |
Ten years after the publication of “Recent advances in Upper Jurassic (Kimmeridgian-Tithonian) ammonite biostratigraphy of northcentral Mexico, based on recently collected ammonite assemblages”, a working program based on bed-by-bed sampling of upper Jurassic sections in Mexico has allowed to improve information about known and new outcrops in northeastern, central-eastern and south-eastern Mexico. The present contribution provides an updating of the obtained information, a part of which has been published elsewhere. Of special relevance are new data concerning Oxfordian and latest Kimmeridgian/earliest Tithonian ammonites from centraleast and south-eastern Mexico, which are considered as preliminar information of prime importance for correlation. A re-evaluation of registered ammonite assemblages is made in terms of faunal – ammonite – horizons of three orders of relevance for biostratigraphic correlation in Mexico. They integrate within the ammonite assemblages formally proposed previously, and their biochronostratigraphic meaning is only tentatively approached due to the incidence of endemism.
Middle Jurassic - Lower Cretaceous ammonites & aptychi