Richard L Hay
Dados Biográficos
| ID | 3957499 |
|---|---|
| NOME | Richard L Hay |
| PRENOMES | Richard L |
| SOBRENOME | Hay |
| ASSINATURA | HAY R L |
| AFILIAÇÕES | University of Illinois Urbana-Champaign |
| VERIFICADO | Não |
| TOTAL DE OBRAS | 20 |
| TOTAL DE CITAÇÕES | 201 |
| TOTAL COMO AUTOR | 20 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 1965 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2023 |
| ÍNDICE H | 6 |
Geology of the Olduvai Gorge
Geological observations of excavated sand ( harenae fossiciae ) used as fine aggregate in Roman pozzolanic mortars
An abstract is not available for this content so a preview has been provided. Please use the Get access link above for information on how to access this content
The Judicious Selection and Preservation of Tuff and Travertine Building Stone in Ancient Rome
The Republican and early Imperial monuments of Rome are, for the most part, built of tuffs quarried from at least seven pyroclastic deposits erupted from nearby Monti Sabatini and Alban Hills volcanoes. Remarks by Vitruvius (2.7.1–5), field observations of the monuments, and petrographic and rock testing studies of samples from Roman quarries demonstrate that Roman builders developed a good knowledge of the diverse material properties of the tuff…
Late Pliocene Homo and Hominid Land Use from Western Olduvai Gorge, Tanzania
Excavation in the previously little-explored western portion of Olduvai Gorge indicates that hominid land use of the eastern paleobasin extended at least episodically to the west. Finds included a dentally complete Homo maxilla (OH 65) with lower face, Oldowan stone artifacts, and butchery-marked bones dated to be between 1.84 and 1.79 million years old. The hominid shows strong affinities to the KNM ER 1470 cranium from Kenya ( Homo rudolfensis …
Potassium-argon dating of Bed I, Olduvai Gorge, 1961–1972
Tephrochronology of Bed I, Olduvai Gorge
Sources of the Quartzite of Some Ancient Egyptian Sculptures
This article reports the results of analysis of samples collected from some Egyptian quartzite artifacts. such as statuary, dating from the New Kingdom. Most of the artifacts are located in Upper Egypt, but the results of analysis suggest that, until the middle of the fourteenth century B.C., the quartzite came from a more distant quarry near Cairo rather than from the quartzite quarries located near Aswan in Upper Egypt
An Isotopic Study of Paleosol Carbonates from Olduvai Gorge
The isotopic composition of paleosol carbonates from Olduvai Gorge can be used to give estimates of the paleoclimatic history of East Africa during the Plio-Pleistocene. Oxygen isotopes are indicative of major changes in the isotopic composition of meteoric water, while carbon isotopes are indicative of major changes in the fraction of biomass using the Hatch-Slack (C 4 ) photosynthetic pathway. Three major periods of climatic change in this terr…
The Northern Colossus of Memnon
Chemical and petrographic studies of the two 720‐ton ‘Colossi of Memnon’ located near Luxor, and of Egyptian quartzite quarries indicate that the rear pedestal blocks of the northern statue were quarried at Aswan, while the other, main components of the monuments were quarried near Cairo. Our studies suggest that the rear pedestal blocks of the northern statue were part of the reconstruction project undertaken by Roman emperor Septimius Severus. …
Interrupted Time-Series Analysis
Pliocene footprints in the Laetolil Beds at Laetoli, northern Tanzania
Third World Urbanization
The Geology of Olduvai Gorge
Geology of the Olduvai Gorge
Fossil hominids from the Laetolil Beds
The MNK Chert factory site, Olduvai Gorge, Tanzania
The stone material from the MNK Chert Factory Site, located in Bed II at Olduvai Gorge, is described and the site is placed within its paleogeographical context. A small proportion of the utilized chert resembles the in situ material, but most of the flaked chert is of nodules from other sources, most of which were probably not far distant. An attribute analysis was performed on a sample of the whole flakes at the factory site and on the chert wh…
Lithofacies and Environments of Bed I, Olduvai Gorge, Tanzania
Bed I in Olduvai Gorge spans the interval from about 1.7 to 2.0 m.y.a., and all evidences of hominid activity at Olduvai are within the latter half of this period. Bed I was deposited in a closed basin approximately 25 km in average diameter, and it can be subdivided into five lithologically different but partly time-equivalent rock assemblages, or lithologic facies, each of which was deposited in the same geographic environment or closely relate…
Stratigraphy, archaeology, and age of the Ndutu and Naisiusiu Beds, Olduvai Gorge, Tanzania
The upper part of the stratigraphic section of Olduvai Gorge is subdivided into the Ndutu Beds and the Naisiusiu Beds ; Beds Va and V are abandoned as stratigraphic terms. The Naisiusiu Beds are uppermost Pleistocene and give C14 dates of 10,400 to 17,550 B.P.; the Ndutu Beds are largely upper Pleistocene, but may include middle Pleistocene deposits. Faulting in the Olduvai region continued through the deposition of the Ndutu Beds, but apparently…
The Potassium-Argon Dating of Late Cenozoic Rocks in East Africa and Italy [and Comments and Reply]
A technique for the potassium-argon dating of high potassium feldspars of less than 50,000 years age is described. The technique is applied to the obtaining of high precision ages in the time-range 60,000-2,000,000 years. Sufficient data are presented to show that the time-scale of Plio-Pleistocene glaciations is greater than 10 years and that the time-scale of hominoids capable of fashioning tools by the working of stone is at least 1.75 10 year…
Stratigraphy of Beds I Through IV, Olduvai Gorge, Tanganyika
Stratigraphy, archaeology, and age of the Ndutu and Naisiusiu Beds, Olduvai Gorge, Tanzania
The upper part of the stratigraphic section of Olduvai Gorge is subdivided into the Ndutu Beds and the Naisiusiu Beds ; Beds Va and V are abandoned as stratigraphic terms. The Naisiusiu Beds are uppermost Pleistocene and give C14 dates of 10,400 to 17,550 B.P.; the Ndutu Beds are largely upper Pleistocene, but may include middle Pleistocene deposits. Faulting in the Olduvai region continued through the deposition of the Ndutu Beds, but apparently…
The MNK Chert factory site, Olduvai Gorge, Tanzania
The stone material from the MNK Chert Factory Site, located in Bed II at Olduvai Gorge, is described and the site is placed within its paleogeographical context. A small proportion of the utilized chert resembles the in situ material, but most of the flaked chert is of nodules from other sources, most of which were probably not far distant. An attribute analysis was performed on a sample of the whole flakes at the factory site and on the chert wh…
The Potassium-Argon Dating of Late Cenozoic Rocks in East Africa and Italy [and Comments and Reply]
A technique for the potassium-argon dating of high potassium feldspars of less than 50,000 years age is described. The technique is applied to the obtaining of high precision ages in the time-range 60,000-2,000,000 years. Sufficient data are presented to show that the time-scale of Plio-Pleistocene glaciations is greater than 10 years and that the time-scale of hominoids capable of fashioning tools by the working of stone is at least 1.75 10 year…
Tephrochronology of Bed I, Olduvai Gorge
Geological observations of excavated sand ( harenae fossiciae ) used as fine aggregate in Roman pozzolanic mortars
An abstract is not available for this content so a preview has been provided. Please use the Get access link above for information on how to access this content
The Judicious Selection and Preservation of Tuff and Travertine Building Stone in Ancient Rome
The Republican and early Imperial monuments of Rome are, for the most part, built of tuffs quarried from at least seven pyroclastic deposits erupted from nearby Monti Sabatini and Alban Hills volcanoes. Remarks by Vitruvius (2.7.1–5), field observations of the monuments, and petrographic and rock testing studies of samples from Roman quarries demonstrate that Roman builders developed a good knowledge of the diverse material properties of the tuff…
The Northern Colossus of Memnon
Chemical and petrographic studies of the two 720‐ton ‘Colossi of Memnon’ located near Luxor, and of Egyptian quartzite quarries indicate that the rear pedestal blocks of the northern statue were quarried at Aswan, while the other, main components of the monuments were quarried near Cairo. Our studies suggest that the rear pedestal blocks of the northern statue were part of the reconstruction project undertaken by Roman emperor Septimius Severus. …
Sources of the Quartzite of Some Ancient Egyptian Sculptures
This article reports the results of analysis of samples collected from some Egyptian quartzite artifacts. such as statuary, dating from the New Kingdom. Most of the artifacts are located in Upper Egypt, but the results of analysis suggest that, until the middle of the fourteenth century B.C., the quartzite came from a more distant quarry near Cairo rather than from the quartzite quarries located near Aswan in Upper Egypt
Stratigraphy of Beds I Through IV, Olduvai Gorge, Tanganyika
The Potassium-Argon Dating of Late Cenozoic Rocks in East Africa and Italy [and Comments and Reply]
A technique for the potassium-argon dating of high potassium feldspars of less than 50,000 years age is described. The technique is applied to the obtaining of high precision ages in the time-range 60,000-2,000,000 years. Sufficient data are presented to show that the time-scale of Plio-Pleistocene glaciations is greater than 10 years and that the time-scale of hominoids capable of fashioning tools by the working of stone is at least 1.75 10 year…
Stratigraphy of Beds I Through IV, Olduvai Gorge, Tanganyika
Stratigraphy, archaeology, and age of the Ndutu and Naisiusiu Beds, Olduvai Gorge, Tanzania
The upper part of the stratigraphic section of Olduvai Gorge is subdivided into the Ndutu Beds and the Naisiusiu Beds ; Beds Va and V are abandoned as stratigraphic terms. The Naisiusiu Beds are uppermost Pleistocene and give C14 dates of 10,400 to 17,550 B.P.; the Ndutu Beds are largely upper Pleistocene, but may include middle Pleistocene deposits. Faulting in the Olduvai region continued through the deposition of the Ndutu Beds, but apparently…
Lithofacies and Environments of Bed I, Olduvai Gorge, Tanzania
Bed I in Olduvai Gorge spans the interval from about 1.7 to 2.0 m.y.a., and all evidences of hominid activity at Olduvai are within the latter half of this period. Bed I was deposited in a closed basin approximately 25 km in average diameter, and it can be subdivided into five lithologically different but partly time-equivalent rock assemblages, or lithologic facies, each of which was deposited in the same geographic environment or closely relate…
The MNK Chert factory site, Olduvai Gorge, Tanzania
The stone material from the MNK Chert Factory Site, located in Bed II at Olduvai Gorge, is described and the site is placed within its paleogeographical context. A small proportion of the utilized chert resembles the in situ material, but most of the flaked chert is of nodules from other sources, most of which were probably not far distant. An attribute analysis was performed on a sample of the whole flakes at the factory site and on the chert wh…
Geology of the Olduvai Gorge
Fossil hominids from the Laetolil Beds
The Geology of Olduvai Gorge
Pliocene footprints in the Laetolil Beds at Laetoli, northern Tanzania
Third World Urbanization
Interrupted Time-Series Analysis
The Northern Colossus of Memnon
Chemical and petrographic studies of the two 720‐ton ‘Colossi of Memnon’ located near Luxor, and of Egyptian quartzite quarries indicate that the rear pedestal blocks of the northern statue were quarried at Aswan, while the other, main components of the monuments were quarried near Cairo. Our studies suggest that the rear pedestal blocks of the northern statue were part of the reconstruction project undertaken by Roman emperor Septimius Severus. …
An Isotopic Study of Paleosol Carbonates from Olduvai Gorge
The isotopic composition of paleosol carbonates from Olduvai Gorge can be used to give estimates of the paleoclimatic history of East Africa during the Plio-Pleistocene. Oxygen isotopes are indicative of major changes in the isotopic composition of meteoric water, while carbon isotopes are indicative of major changes in the fraction of biomass using the Hatch-Slack (C 4 ) photosynthetic pathway. Three major periods of climatic change in this terr…
Sources of the Quartzite of Some Ancient Egyptian Sculptures
This article reports the results of analysis of samples collected from some Egyptian quartzite artifacts. such as statuary, dating from the New Kingdom. Most of the artifacts are located in Upper Egypt, but the results of analysis suggest that, until the middle of the fourteenth century B.C., the quartzite came from a more distant quarry near Cairo rather than from the quartzite quarries located near Aswan in Upper Egypt
Potassium-argon dating of Bed I, Olduvai Gorge, 1961–1972
Tephrochronology of Bed I, Olduvai Gorge
Late Pliocene Homo and Hominid Land Use from Western Olduvai Gorge, Tanzania
Excavation in the previously little-explored western portion of Olduvai Gorge indicates that hominid land use of the eastern paleobasin extended at least episodically to the west. Finds included a dentally complete Homo maxilla (OH 65) with lower face, Oldowan stone artifacts, and butchery-marked bones dated to be between 1.84 and 1.79 million years old. The hominid shows strong affinities to the KNM ER 1470 cranium from Kenya ( Homo rudolfensis …
The Judicious Selection and Preservation of Tuff and Travertine Building Stone in Ancient Rome
The Republican and early Imperial monuments of Rome are, for the most part, built of tuffs quarried from at least seven pyroclastic deposits erupted from nearby Monti Sabatini and Alban Hills volcanoes. Remarks by Vitruvius (2.7.1–5), field observations of the monuments, and petrographic and rock testing studies of samples from Roman quarries demonstrate that Roman builders developed a good knowledge of the diverse material properties of the tuff…
Geological observations of excavated sand ( harenae fossiciae ) used as fine aggregate in Roman pozzolanic mortars
An abstract is not available for this content so a preview has been provided. Please use the Get access link above for information on how to access this content
Geology of the Olduvai Gorge
Archaeology (13 obras) · Geography (13 obras) · Geology (12 obras) · Geology (11 obras) · Olduvai Gorge (11 obras) · Paleontology (10 obras) · Pleistocene-Era Hominins and Archaeology (8 obras) · Geochemistry (7 obras) · Paleontology (7 obras) · Evolution and Paleontology Studies (5 obras)