Stratigraphic and tectonic framework of the Ligurian Units in the Castellina M.ma Hills (southern Tuscany, Italy)
Ligurian ophiolitic complexes crop out extensively in southern Tuscany. In this paper the AA. present new data on the Castellina M.ma Hills ophiolite-bearing units, and review and discuss implications for the regional stratigraphic and structural
evolution of the Ligurian Units in southern Tuscany. - (NF)
Stratigraphic revision of the Cenozoic deposits of the Lungro-Verbicaro Unit (Northern Calabria): new data for the reconstruction of tectonic evolution of the southern Apennines
Stratigraphic principles and practices as related to soil mantles
Propose des révisions dans la stratigraphie pléistocène des paléosols et des surfaces d'altération en fonction des données récentes et en corrélation avec les échelles 0 des océans et la distinction d'unités pédostratigraphiques telles que
C 14 dating ; Earthquake ; Fault ; Geochronology ; Geological map ; Quaternary ; Seismicity ; United States ; Utah
This study included interpretation of aerial photographs, detailed geologic mapping of surficial deposits at trench sites, profiling fault scarps, excavating and mapping trenches at two sites, and radiocarbon dating key stratigraphicunits
. The results emphasize the importance of integrating stratigraphic and geomorphic information in fault investigations for earthquake hazard evaluations.
Within the context of the new age control, the purposes of this paper are to: 1) identify, map and correlate fluvial terraces along the lower Susquehanna River; 2) assign ages to the terraces by downstream correlation to the fluvial stratigraphic
Alluvium ; Arid area ; Arizona ; Flood ; Floodplain ; Fluvial processes ; Geochronology ; Holocene ; Quaternary ; Sediment budget ; Stratigraphy ; United States of America
This paper presents the first comprehensive stratigraphic study of the late Quaternary history of the Gila River, the largest perennial stream in southern Arizona. The alluvial stratigraphic sequence presented here for the Gila River provides
Heavy minerals as a stratigraphical tool for the Eemian and Post-Eemian deposits in the lower Lys valley (Belgium)
The lithostratigraphic units in the Upper-Pleistocene Lys valley may be subdivided into two distinct populations, each with its own characteristic heavy mineral assemblage. The Eemian and Early Weichselian sediments originate mainly from the erosion
A review of amino acid racemization studies in Quaternary mollusks: stratigraphic and chronologic applications in coastal and interglacial sites, Pacific and Atlantic coasts, United States, United Kingdom, Baffin Island, and Tropical islands
Amino acid racemization (AAR) studies of Quaternary mollusks (mostly marine mollusks from coastal deposits) are reviewed. Data obtained in regional studies from the US Atlantic and Pacific coasts, Baffin Island, the United Kingdom, and tropical
Field and laboratory analyses carried out on the sedimentary successions of Monte San Giovanni Campano, Fontana Liri and Rocca d'Arce (southern Latium) allow the AA. to recognize some unconformity-bounded stratigraphicunits (UBSU) within
the Messinian portion of the local stratigraphical succession. The structural and stratigraphic features of the recognized UBSU allow the AA. To locate their related sedimentary basin within the frontal portion of the Apennine chain, behind the leading edge
Stratigraphic and microfossil evidence for late Holocene tsunamis at Swantown marsh, Whidbey Island, Washington
Earthquake ; Holocene ; Palaeo-ecology ; Palaeo-environment ; Plate tectonics ; Quaternary ; Sedimentology ; Stratigraphy ; Tidal marsh ; Tsunami ; United States of America ; Washington State
The AA. report stratigraphic and paleoecologic findings from a tidal marsh on the west coast of Whidbey Island, Washington, where 4 muddy sand layers were found in the peat underlying the marsh. These sand sheets record repeated inundation
Old Crow tephra: a new Late Pleistocene stratigraphic marker across north-central Alaska and western Yukon Territory
Old Crow tephra is the first extensive Pleistocene tephra unit to be documented in the northwestern part of North America. It has an age between the limits of 60,000 and 12,000 yr, set by C and fission-track measurements, respectively. Old Crow
to the distant locations of potential Quaternary volcanic sources, demonstrate the widespread distribution of this tephra and underscore its importance as a regional stratigraphic marker.
Alluvium ; Correlation ; Floodplain ; Fluvial terrace ; Palaeoclimate ; Quaternary ; Stratigraphy ; Texas ; United States of America ; Watershed
This paper presents the late Quaternary alluvial stratigraphic study of a low-order tributary in central Texas, using Cowhouse Creek as a case study. The AA. correlate episodes of stream incision and alluviation to climate records and to previous
alluvial stratigraphic work conducted along the Brazos River. The temporal alluvial stratigraphic framework of the bedrock-confined Cowhouse Creek valley is out of phase with the alluvial sequence in the larger Brazos River valley.
California ; Dating ; Geochronology ; Isotope dating ; Nevada ; Pleistocene ; Quaternary ; Stratigraphic correlation ; Tephrochronology ; United States of America ; Volcanic ash
The age of the Rockland tephra, which includes an ash-flow tuff south and west of Lassen Peak in northern California and a widespread ash-fall deposit that produced a distinct stratigraphic marker in western North America, is constrained to 565,000
to 610,000 yr by direct dating using Ar 40/Ar 39 and U-Pb methods and by stratigraphy. Identification of Rockland tephra in ODP core 1018 offshore of central California is an important stratigraphic age that also constrains the eruption age to between 580,000
Extensive early and middle Wisconsin glaciation on the Western Olympic Peninsula, Washington, and the variability of Pacific moisture delivery to the Northwestern United States
C 14 dating ; Geomorphology ; Glaciation ; Glacier advance ; Palaeogeography ; Palynology ; Quaternary ; Stratigraphy ; United States of America ; Washington State ; Wisconsinan
Large glaciers descended western valleys of the Olympic Mountains six times during the last (Wisconsin) glaciation, terminating in the Pacific coastal lowlands. The glaciers constructed extensive landforms and thick stratigraphic sequences, which
commonly contain wood and other organic detritus. The organic material, coupled with stratigraphic data, provides a detailed radiocarbon chronology of late Pleistocene ice-margin fluctuations. The timing of glacier advances suggests causal links with North
Holocene glacial sequence and soils of stratigraphic importance, Mer de Glace, Western Alps, France
Dans les Alpes occidentales, par l'analyse des limites glaciaires, mise en évidence de trois unités majeures : un groupe récent de deux ensembles de moraines datant du classique « Petit Age Glaciaire », et des moraines plus anciennes de l'Holocène
sur les moraines sont utiles pour distinguer les unités stratigraphiques.
This study is aimed at distinguishing colluvial units which are tectonically induced from those which are not, by using pedogenic and stratigraphic characteristics.