By Yohannes Haile-Selassie, Giday WoldeGabriel
The second one quantity in a chain devoted to fossil discoveries made within the Afar area of Ethiopia, this paintings comprises the definitive description of the geological context and paleoenvironment of the early hominid Ardipithecus kadabba. This study by means of a global group describes heart Awash overdue Miocene faunal assemblages recovered from sediments firmly dated to among 5.2 and 5.8 million years in the past. in comparison to different assemblages of comparable age, the center Awash list is unheard of in taxonomic range, composed of 2,760 specimens representing at the very least 65 mammalian genera. This finished evaluate of the vertebrates from the tip of the Miocene in Africa presents designated morphological and taxonomic descriptions of dozens of taxa, together with species new to technology. It additionally comprises effects from analyses of paleoenvironment, paleobiogeography, biochronology, and faunal turnover round the Pliocene-Miocene boundary, commencing a brand new window at the evolution of mammals, African fauna, and its environments.
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Extra info for Ardipithecus kadabba: Late Miocene Evidence from the Middle Awash, Ethiopia (The Middle Awash Series)
This northern area is currently geologically less studied than its southern counterpart. Preliminary radiometric dates indicate that the Jara-Borkana localities might be slightly older than the localities in the Adu-Asa Formation (see Chapter 4). However, the taxonomic diversity is minimal, and vertebrate fossils are not as abundant as at late Miocene localities further south. Work in this region, and in the Gona area further to the north (Quade et al. 2004), is continuing and promises to expand the overall late Miocene record of this part of the Afar.
Samples from major tuﬀ units interbedded within fossiliferous sediments were collected from some of the sections and subsequently dated. Following the resumption of ﬁeld research in the Middle Awash study area in 1990, the project conducted two successful seasons of geological, paleontological, and archaeological investigations on the east side of the rift ﬂoor of the Middle Awash study area (fall of 1990 and 1991). However, the focus of the exploratory studies shifted to the west side of the Awash River beginning in 1992.
The faunal assemblages described in 12 chapters of this volume document diverse evolutionary trajectories for the late Miocene mammalian fauna of eastern Africa. 3. The assemblages indicate a number of originations and extinctions in various groups adapted to diﬀerent habitats. Chapter 19 looks at the biochronological and evolutionary signiﬁcance of the Middle Awash faunal assemblages by looking at possible ﬁrst appearance (FA) and last appearance (LA). It synthesizes the information to look into faunal turnovers and their probable causes.