Search Results - "Brown, Francis"

SINGLE-VALUED MOTIVIC PERIODS AND MULTIPLE ZETA VALUES by BROWN, FRANCIS

“…The values at 1 of single-valued multiple polylogarithms span a certain subalgebra of multiple zeta values. The properties of this algebra are studied from the…”
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A CLASS OF NONHOLOMORPHIC MODULAR FORMS II: EQUIVARIANT ITERATED EISENSTEIN INTEGRALS by BROWN, FRANCIS

“…We introduce a new family of real-analytic modular forms on the upper-half plane. They are arguably the simplest class of ‘mixed’ versions of modular forms of…”
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High-temperature environments of human evolution in East Africa based on bond ordering in paleosol carbonates by Passey, Benjamin H., Levin, Naomi E., Cerling, Thure E., Brown, Francis H., Eiler, John M., Turekian, Karl K.

“…Many important hominid-bearing fossil localities in East Africa are in regions that are extremely hot and dry. Although humans are well adapted to such…”
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ZETA ELEMENTS IN DEPTH 3 AND THE FUNDAMENTAL LIE ALGEBRA OF THE INFINITESIMAL TATE CURVE by BROWN, FRANCIS

“…This paper draws connections between the double shuffle equations and structure of associators; Hain and Matsumoto’s universal mixed elliptic motives; and the…”
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Dietary changes of large herbivores in the Turkana Basin, Kenya from 4 to 1 Ma by Cerling, Thure E., Andanje, Samuel A., Blumenthal, Scott A., Brown, Francis H., Chritz, Kendra L., Harris, John M., Hart, John A., Kirera, Francis M., Kaleme, Prince, Leakey, Louise N., Leakey, Meave G., Levin, Naomi E., Manthi, Fredrick Kyalo, Passey, Benjamin H., Uno, Kevin T.

“…A large stable isotope dataset from East and Central Africa from ca. 30 regional collection sites that range from forest to grassland shows that most extant…”
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Aridity and hominin environments by Blumenthal, Scott A., Levin, Naomi E., Brown, Francis H., Brugal, Jean-Philip, Chritz, Kendra L., Harris, John M., Jehle, Glynis E., Cerling, Thure E.

“…Aridification is often considered a major driver of long-term ecological change and hominin evolution in eastern Africa during the Plio-Pleistocene; however,…”
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Geochronology of the Turkana Depression of Northern Kenya and Southern Ethiopia by Brown, Francis H., Mcdougall, Ian

“…Mesozoic and Cenozoic sedimentary rocks in the Turkana Depression of northern Kenya and southern Ethiopia rest on basement rocks that yield K/Ar cooling ages…”
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Stratigraphic placement and age of modern humans from Kibish, Ethiopia by Fleagle, John G, Brown, Francis H, McDougall, Ian

“…In 1967 the Kibish Formation in southern Ethiopia yielded hominid cranial remains identified as early anatomically modern humans, assigned to Homo sapiens …”
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Stable isotope-based diet reconstructions of Turkana Basin hominins by Cerling, Thure E., Manthi, Fredrick Kyalo, Mbua, Emma N., Leakey, Louise N., Leakey, Meave G., Leakey, Richard E., Brown, Francis H., Grine, Frederick E., Hart, John A., Kaleme, Prince, Roche, Hélène, Uno, Kevin T., Wood, Bernard A.

“…Hominin fossil evidence in the Turkana Basin in Kenya from ca. 4.1 to 1.4 Ma samples two archaic early hominin genera and records some of the early…”
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Paleosol carbonates from the Omo Group: Isotopic records of local and regional environmental change in East Africa by Levin, Naomi E., Brown, Francis H., Behrensmeyer, Anna K., Bobe, René, Cerling, Thure E.

“…Pliocene and Pleistocene sedimentary rocks from the Omo–Turkana Basin in East Africa are well known for fossil and archeological evidence of human evolution…”
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Correlation of volcanic ash layers between the Early Pleistocene Acheulean sites of Isinya, Kariandusi, and Olorgesailie, Kenya by Durkee, Hannah, Brown, Francis H.

“…Olorgesailie, Kariandusi, and Isinya are archeological sites with Acheulean artifacts in or on the flanks of the southern Rift Valley of Kenya. 40Ar/39Ar ages…”
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Early Pleistocene third metacarpal from Kenya and the evolution of modern human-like hand morphology by Ward, Carol V., Tocheri, Matthew W., Plavcan, J. Michael, Brown, Francis H., Manthi, Fredrick Kyalo

“…Despite discoveries of relatively complete hands from two early hominin species (Ardipithecus ramidus and Australopithecus sediba) and partial hands from…”
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New single crystal 40Ar/39Ar ages improve time scale for deposition of the Omo Group, Omo-Turkana Basin, East Africa by McDougall, Ian, Brown, Francis H, Vasconcelos, Paulo M, Cohen, Benjamin E, Thiede, David S, Buchanan, Michael J

“…Six tuffaceous beds within the Omo Group of the Omo-Turkana Basin have been dated using the 40Ar/39Ar single crystal total fusion method on anorthoclase,…”
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Geochronology of the pre-KBS Tuff sequence, Omo Group, Turkana Basin by McDougall, Ian, Brown, Francis H

“…The Omo-Turkana Basin of northern Kenya and southern Ethiopia developed in the northern Kenya Rift about 4.3 Ma ago in the Early Pliocene. Nearly 800 m of…”
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Dedekind zeta motives for totally real number fields by Brown, Francis C. S.

“…Let k be a totally real number field. For every odd n ≥3, we construct an element in the category MT( k ) of mixed Tate motives over k out of the quotient of a…”
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Correlation of the KHS Tuff of the Kibish Formation to volcanic ash layers at other sites, and the age of early Homo sapiens (Omo I and Omo II) by Brown, Francis H., McDougall, Ian, Fleagle, John G.

“…Hominin specimens Omo I and Omo II from Member I of the Kibish Formation, Ethiopia are attributed to early Homo sapiens, and an age near 196 ka has been…”
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Kantis: A new Australopithecus site on the shoulders of the Rift Valley near Nairobi, Kenya by Mbua, Emma, Kusaka, Soichiro, Kunimatsu, Yutaka, Geraads, Denis, Sawada, Yoshihiro, Brown, Francis H., Sakai, Tetsuya, Boisserie, Jean-Renaud, Saneyoshi, Mototaka, Omuombo, Christine, Muteti, Samuel, Hirata, Takafumi, Hayashida, Akira, Iwano, Hideki, Danhara, Tohru, Bobe, René, Jicha, Brian, Nakatsukasa, Masato

“…Most Plio-Pleistocene sites in the Gregory Rift Valley that have yielded abundant fossil hominins lie on the Rift Valley floor. Here we report a new Pliocene…”
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Stratigraphy and tephra of the Kibish Formation, southwestern Ethiopia by Brown, Francis H., Fuller, Chad R.

“…The Kibish Formation in southwestern Ethiopia, with an aggregate thickness of ~105 m, consists of lacustrine, marginal lacustrine, and deltaic deposits. It is…”
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Co-occurrence of Acheulian and Oldowan artifacts with Homo erectus cranial fossils from Gona, Afar, Ethiopia by Semaw, Sileshi, Rogers, Michael J, Simpson, Scott W, Levin, Naomi E, Quade, Jay, Dunbar, Nelia, McIntosh, William C, Cáceres, Isabel, Stinchcomb, Gary E, Holloway, Ralph L, Brown, Francis H, Butler, Robert F, Stout, Dietrich, Everett, Melanie

“…Although stone tools generally co-occur with early members of the genus , they are rarely found in direct association with hominins. We report that both…”
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Precise 40Ar/39Ar geochronology for the upper Koobi Fora Formation, Turkana Basin, northern Kenya by McDougall, Ian, Brown, Francis H

“…The Plio-Pleistocene Koobi Fora Formation, about 560 m thick, crops out east of Lake Turkana and is part of the much larger depositional system of the…”
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