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Showing results for the phrase "Vendor: W. A. Benjamin, Inc. :: vendor_series" in Source Type Detail.

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Description
View from the north end of Lake Natron. The active volcano Lengai can be seen in the far distance. The modern delta of the Peninj River can be seen projecting into the lake from the right. The flower is a desert rose (Adensonia sp.)
Date of Photo
1975
Holdings
35mm slide: 16101
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

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Description
The same view from slide #16101 a few years later when the shallow salty lake has partly dried-up.
Date of Photo
1975
Holdings
35mm slide: 16102
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

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Description
Air view of the escarpment that runs parallel to the western shore of the lake. The faults creating this scarp have moved mainly since the deposition of the Peninj fossiliferous beds. The plain above runs through a gap to join with the Serengeti at Olduvai Gorge, which is only about 30 miles away.
Date of Photo
1975
Holdings
35mm slide: 16103
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

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Description
A closer view of the fault scarp plus a Pleiocene volcano, Mozonik, that projects through a flood of lavas. Behind is the active volcano Lengai which has been built up entirely since the period in which the Peninj beds were deposited.
Date of Photo
1975
Holdings
35mm slide: 16104
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

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Description
The fault scarps cut the Lower Pleistocene Peninj Group sediments so that some outcrops are down in the Natron trough as seen here, while others over large areas of the plateau above. The Peninj australopithecine jaw was found in the eroded area seen here.
Date of Photo
1975
Holdings
35mm slide: 16105
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

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Description
The gully in which the Peninj jaw was found. The somewhat orange stratum consists of basaltic tuffs in the Humbu Formation, just above the level that yielded the jaw.
Date of Photo
1975
Holdings
35mm slide: 16106
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

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Description
The Peninj australopithecine mandible at the moment of discovery by Mr. Kamoya Kimeu.
Date of Photo
1975
Holdings
35mm slide: 16107
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

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Description
The australopithecine jaw was just projecting a little from an erosion cliff.
Date of Photo
1975
Holdings
35mm slide: 16108
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

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Description
Excavations have disengaged the mandible and it is now ready for removal.
Date of Photo
1975
Holdings
35mm slide: 16109
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

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Description
Subsequently, extensive excavations were undertaken at the site, but no further hominid bones, artifacts, or indeed any useful fossils were found.
Date of Photo
1975
Holdings
35mm slide: 16110
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series
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Description
Diagrams illustrating the stratigraphy and dating of the mandible. It was stratified below one lava dated at 1.3 million years and also below another one with normal polarity. This suggests Olduvai event age 1.8 - 1.6 million years (see Isaac and Curtis, 1974).
Date of Photo
1975
Holdings
35mm slide: 16111
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

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Description
An Olivine basalt flow in Humbu Formation tuffs. These tuffs are equivalent to the tuffs just above the mandible. The potassium-argon age of the lava thus helps to date the mandible (Isaac and Curtis, 1974).
Date of Photo
1975
Holdings
35mm slide: 16112
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

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Description
Above the fault scarp, Lower Pleistocene sediments occur over a very wide area, but are mostly covered with vegetation and soil.
Date of Photo
1975
Holdings
35mm slide: 16113
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
However in one area, far inland from the lake, erosion has exposed a concentration of stone tools at a horizon between that dated to 1.3 and 1.6. This is the site RHS. Here Margaret Leakey and Glynn Isaac sort specimens from the eroded surface of this site.
Date of Photo
1975
Holdings
35mm slide: 16114
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

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Description
Excavation at RHS uncovered the sandy bank of a small stream channel; strewn with very early Acheulian stone tools.
Date of Photo
1975
Holdings
35mm slide: 16115
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

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Description
Detail of the excavation at RHS. Mr. Kitibe Kimeu uncovers Acheulian artifacts.
Date of Photo
1975
Holdings
35mm slide: 16116
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
An early Acheulian hand-axe made on a large flake from the site of RHS. The assemblage is 1.3 - 1.6 million years old, and along with EFHR at Olduvai is the oldest securely-dated Acheulian known.
Date of Photo
1975
Holdings
35mm slide: 16117
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
An early Acheulian cleaver from RHS made on a large flake.
Date of Photo
1975
Holdings
35mm slide: 16118
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

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Description
A view from the edge of the Rift Valley looking down to the Olorgesailie basin on the floor of the complex trough.
Date of Photo
1975
Holdings
35mm slide: 16119
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
An air view of the floor at the Rift in the Olorgesailie area showing how "grid formation" has broken the terrain into a series of troughs and ridges. Some of the troughs are still seasonally flooded.
Date of Photo
1975
Holdings
35mm slide: 16120
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series
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Description
Olorgesailie takes its name form the Masai word for the mountain seen behind this group of Masai women and children.
Date of Photo
1975
Holdings
35mm slide: 16121
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
An air view of the main site at Olorgesailie where a series of museum-on-the-spot exhibits were established in 1947 by Drs. Louis and Mary Leakey.
Date of Photo
1975
Holdings
35mm slide: 16122
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
Erosion has exposed hundreds of hand-axes at this site and a catwalk has been erected to enable visitors to examine them without damaging them.
Date of Photo
1975
Holdings
35mm slide: 16123
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

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Description
An excavation in the outcrop adjacent to the catwalk shows our horizon strewn with artifacts that have not yet been exposed by the advancing erosion front.
Date of Photo
1975
Holdings
35mm slide: 16124
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
A detail of part of this horizon.
Date of Photo
1975
Holdings
35mm slide: 16125
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
Excavations nearby disclosed the existence of a dense patch of artifacts that had not yet been cut into by erosion. This patch has a diameter of 12 - 15 m. and contains more than a tone of stone, which was apparently imported by early man. This is the site of DE/89 horizon B. The material has been concentrated by current action in part of the seasonal streambed in which the early humans camped.
Date of Photo
1975
Holdings
35mm slide: 16126
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
Site DE/89- Part of the dense patch of material.
Date of Photo
1975
Holdings
35mm slide: 16127
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
Site DE/89- Mr. Kashilu Kanunga at work exposing the material.
Date of Photo
1975
Holdings
35mm slide: 16128
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
Site DE/89 B- Close-up showing bones (femurs in this case) of the extinct primate species Theropithecus (Simopethecus) which was hunted in quantity by the occupants of this site.
Date of Photo
1975
Holdings
35mm slide: 16129
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
Site DE/89 B & A- Another horizon (A) underlies the main horizon. Part of this has been exposed.
Date of Photo
1975
Holdings
35mm slide: 16130
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series
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Access to media is restricted to U-M users.
Description
Site DE/89 C- Above the main horizon another small patch of artifacts were found (horizon C). These had to be removed before we could dig down to the large patch.
Date of Photo
1975
Holdings
35mm slide: 16131
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
Site DE/89 C- A tree root associated with the horizon.
Date of Photo
1975
Holdings
35mm slide: 16132
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
Site DE/89- The whole site has been covered with a roof to preserve it as an exhibit.
Date of Photo
1975
Holdings
35mm slide: 16133
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
A group of Acheulian cleavers from Olorgesailie with their edges damaged by use.
Date of Photo
1975
Holdings
35mm slide: 16134
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
Small tools from the Olorgesailie Acheulian sites: scraper, nosed and beaked forms, and a notched piece. Most artifacts, both large and small, are made of lavas from the vicinity of the lake basin. This selection is of obsidian, quartz and chert which were presumably brought in from more remote areas.
Date of Photo
1975
Holdings
35mm slide: 16135
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series

Access to media is restricted to U-M users.
Description
Bone food refuse at most Olorgesailie sites had been smashed up into small pieces. Presumably, at least in part, to extract marrow.
Date of Photo
1975
Holdings
35mm slide: 16136
Source Type Detail
Vendor: W. A. Benjamin, Inc. :: vendor_series
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