Stratigraphy of the A wash Group, Middle A wash Valley, Afar, Ethiopia

Kalb, Jon E.; Oswald, Elizabeth B.; Mebrate, Assefa; Tebedge, Sleshi; Jolly, Clifford J.

doi:10.1127/nos/11/1982/95

Cited by 26 publications

(5 citation statements)

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“…The left I 2 is metrically and morphologically comparable to known later hominid incisors and distinctively narrower than the lateral incisors of chimpanzees (Pan troglodytes). The P 4 has a well developed talonid and a Tome's root rather than the single roots reported for Aramis A. ramidus 11 .…”

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confidence: 80%

“…The Early Miocene (16.6±23.7 Myr)¯uvial, alluvial and minor lacustrine red series sediments along the base of this escarpment to the north of the Middle Awash seem to be related to ancestral marginal basins 9,10 . Lithostratigraphic units of the Middle Awash study area were assigned to the Awash Group 11,12 . Previously published stratigraphy based on isolated sections was temporally controlled by biostratigraphy.…”

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confidence: 99%

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Geology and palaeontology of the Late Miocene Middle Awash valley, Afar rift, Ethiopia

WoldeGabriel¹,

Haile‐Selassie

Renne

et al. 2001

Nature

213

106

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The Middle Awash study area of Ethiopia's Afar rift has yielded abundant vertebrate fossils (approximately 10,000), including several hominid taxa. The study area contains a long sedimentary record spanning Late Miocene (5.3-11.2 Myr ago) to Holocene times. Exposed in a unique tectonic and volcanic transition zone between the main Ethiopian rift (MER) and the Afar rift, sediments along the western Afar rift margin in the Middle Awash provide a unique window on the Late Miocene of Ethiopia. These deposits have now yielded the earliest hominids, described in an accompanying paper and dated here to between 5.54 and 5.77 Myr. These geological and palaeobiological data from the Middle Awash provide fresh perspectives on hominid origins and early evolution. Here we show that these earliest hominids derive from relatively wet and wooded environments that were modulated by tectonic, volcanic, climatic and geomorphic processes. A similar wooded habitat also has been suggested for the 6.0 Myr hominoid fossils recently recovered from Lukeino, Kenya. These findings require fundamental reassessment of models that invoke a significant role for global climatic change and/or savannah habitat in the origin of hominids.

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confidence: 80%

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confidence: 99%

Geology and palaeontology of the Late Miocene Middle Awash valley, Afar rift, Ethiopia

WoldeGabriel¹,

Haile‐Selassie

Renne

et al. 2001

Nature

213

106

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“…The colobine, Libypithecus markgrafi, is represented by the relatively complete holotype cranium at the latter site and a few teeth and postcrania at the former (Delson, 1994). Libypithecus has also been listed from the Middle Awash, but from lower in section (Kalb et al, 1982). This diagnosis was based on a mandible from the Kuseralee Member (older than Aramis and currently under analysis by Y. Haile-Selassie), which probably represents a taxon other than Libypithecus.…”

Section: Discussionmentioning

confidence: 99%

New Early Pliocene Cercopithecidae (Mammalia: Primates) from Aramis, Middle Awash Valley, Ethiopia

Frost¹

2001

American Museum Novitates

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The Middle Awash Research Project has collected a large sample of fossil cercopithecids from the Aramis, Kuseralee, and Sagantole drainages in the Middle Awash paleoanthropological study area of Ethiopia. These sites have been securely dated to 4.4 Ma. The craniodental material from this assemblage supports the diagnoses of two distinct new genera and species, which are described here. Pliopapio alemui is a mid-sized papionin represented by a complete cranium, several partial jaw fragments, and many isolated teeth. Kuseracolobus aramisi is a medium-sized colobine represented by several maxillae, mandibles, and other cranial fragments, as well as by isolated teeth. Stratigraphically associated postcranial remains will be discussed in a separate report.Pliopapio alemui is distinctive from other known African papionins in the combination of its cranial, mandibular, and dental morphology. It lacks the diagnostic facial features of Parapapio, as well as the flattened muzzle dorsum, facial fossae, and maxillary ridges of Papio. Moreover, it does not possess any of the derived dental and cranial specializations of Theropithecus. Kuseracolobus aramisi is larger than all modern African colobines, but smaller than all known Cercopithecoides, Paracolobus, and Rhinocolobus. It is distinctive from Cercopithecoides and the colobine from Leadu in its symphyseal, corporal, and gonial morphology, and from Libypithecus, Paracolobus, and Rhinocolobus in its facial morphology.This early Pliocene sample fills a temporal gap between the terminal Miocene and later Pliocene sites and documents the existence of two new cercopithecid taxa, increasing known diversity in the family.

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“…1). Volcanic layers were used as key horizons to subdivide the exposed deposits into members as done with other fossiliferous deposits in the Horn of Africa (e.g., Kalb et al, 1982;Woldegabriel et al, 2000). The member nomenclature originates from local Somali names, and is explained in the beginning of each member description.…”

Section: Methodsmentioning

confidence: 99%

“…Geological and paleontological research in the Afar region started in the 1970´s with studies in the Hadar area (Taieb et al, 1972(Taieb et al, , 1974 and the Rift Valley Research Mission led by Jon Kalb (Kalb et al, 1982), and continues until today.…”

Section: Introductionmentioning

confidence: 99%

Lithostratigraphy of the Late Miocene to Early Pleistocene, hominid-bearing Galili Formation, Southern Afar Depression, Ethiopia

Hujer¹,

Kuiper²,

Viola³

et al. 2015

AJES

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The Horn of Africa is yields famous Miocene to Pleistocene fossil sites including hominid remains. The fossiliferous sediments were deposited in fluvio-deltaic to lacustrine environments. The basin development is mainly controlled by the tectonic development of the Afar Depression. The Galili research area represents a new fossil site in the southern Afar Depression, Ethiopia. The exposed sediments and volcanics have been organized in the 230 m thick Galili Formation that consists in ascending stratigraphic order of the Lasdanan, Dhidinley, Godiray, Lower and Upper Shabeley Laag, Dhagax and Caashacado Members. The individual members are defined by volcanic layers like basalts, ignimbrites and tuffs. Feldspars separated from several volcanic layers have been dated

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Stratigraphy of the A wash Group, Middle A wash Valley, Afar, Ethiopia

Cited by 26 publications

References 0 publications

Geology and palaeontology of the Late Miocene Middle Awash valley, Afar rift, Ethiopia

Geology and palaeontology of the Late Miocene Middle Awash valley, Afar rift, Ethiopia

New Early Pliocene Cercopithecidae (Mammalia: Primates) from Aramis, Middle Awash Valley, Ethiopia

Lithostratigraphy of the Late Miocene to Early Pleistocene, hominid-bearing Galili Formation, Southern Afar Depression, Ethiopia

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