Mary McGann (Former Employee)
Science and Products
Filter Total Items: 15
No Result Found
Filter Total Items: 75
Interferometric Sidescan Bathymetry, Sediment and Foraminiferal Analyses; a New Look at Tomales Bay, California Interferometric Sidescan Bathymetry, Sediment and Foraminiferal Analyses; a New Look at Tomales Bay, California
The United States Geological Survey (USGS) in collaboration with Point Reyes National Sea Shore (PRNS), and the Tomales Bay Watershed Council [http://www.tomalesbaywatershed.org/] has completed a detailed bathymetric survey, and sediment and foraminiferal analyses of the floor of Tomales Bay, California. The study goals are to detail the submarine morphology, the sediment distribution
Authors
Roberto Anima, John L. Chin, David Finlayson, Mary McGann, Florence Wong
High-resolution foraminiferal, isotopic, and trace element records from holocene estuarine deposits of San Francisco Bay, California High-resolution foraminiferal, isotopic, and trace element records from holocene estuarine deposits of San Francisco Bay, California
A 3.5-m gravity core (DJ6-93SF-6) from San Francisco Bay reveals a complex paleoclimatic history of the region over the last 3870 cal YBP. A polynomial equation based on 11 AMS 14C ages provides an excellent age model for the core, and environmental proxies for water temperature and salinity are derived from various foraminiferal abundances, stable carbon and oxygen isotopes, and Mg/Ca...
Authors
M. McGann
Geomorphological, depositional, and foraminiferal indicators of late Quaternary tectonic uplift in Iskenderun Bay, Turkey Geomorphological, depositional, and foraminiferal indicators of late Quaternary tectonic uplift in Iskenderun Bay, Turkey
Iskenderun Bay is a major shallow embayment in the eastern part of the Mediterranean Sea, where the African and Anatolian Plates converge. This tectonically active basin was investigated for oceanographic, sedimentological, geochemical, and foraminiferal parameters. On the basis of the data acquired, the distribution of living and fossil foraminifera in 284 grab and 54 gravity core...
Authors
Valentina Yanko-Hombach, H. Koral, Niyazi Avsar, Irena Motnenko, Mary McGann
Age of Palos Verdes submarine debris avalanche, southern California Age of Palos Verdes submarine debris avalanche, southern California
The Palos Verdes debris avalanche is the largest, by volume, late Quaternary mass-wasted deposit recognized from the inner California Borderland basins. Early workers speculated that the sediment failure giving rise to the deposit is young, taking place well after sea level reached its present position. A newly acquired, closely-spaced grid of high-resolution, deep-tow boomer profiles of...
Authors
W. Normark, M. McGann, R. Sliter
Late Quaternary deposition in the inner basins of the California continental borderland — Part A. Santa Monica Basin Late Quaternary deposition in the inner basins of the California continental borderland — Part A. Santa Monica Basin
Radiocarbon dating of sediment core samples from Santa Monica Basin document Holocene (younger than approximately 11 ka) landslides and fault offsets along the basin margin. The new dates include 17 from six piston cores on the continental slope and 11 from Ocean Drilling Program Site 1015 on the basin floor. The dates, which are based on data from pelagic and benthic foraminifera in...
Authors
William Normark, Mary McGann
Response of benthic foraminifers to sewage discharge and remediation in Santa Monica Bay, California Response of benthic foraminifers to sewage discharge and remediation in Santa Monica Bay, California
Examination of a time series of foraminiferal assemblage distributions on the continental shelf and slope of Santa Monica Bay from 1955 to 1997-1998 suggests that the benthic microfauna have been greatly affected by the quality and character of the municipal sludge and wastewater discharged into the bay over the last half-century by the Hyperion Treatment Plant serving the greater Los...
Authors
M. McGann, C. Alexander, S.M. Bay
Historical and modern distributions of benthic foraminifers on the continental shelf of Monterey Bay, California Historical and modern distributions of benthic foraminifers on the continental shelf of Monterey Bay, California
Historical (early 1930s) and modern samples provide a detailed account of the spatial distribution of benthic foraminifers on the continental shelf of Monterey Bay, California. Ten species among a total of 110 present dominated the 110 samples investigated in the historical study. A cluster analysis of the foraminiferal abundances in the historical study identified five assemblages...
Authors
M. McGann
Invasion by a Japanese marine microorganism in western North America Invasion by a Japanese marine microorganism in western North America
The earliest record in western North America of Trochammina hadai Uchio, a benthic foraminifer common in Japanese estuaries, is from sediment collected in Puget Sound in 1971. It was first found in San Francisco Bay in sediment samples taken in 1983, and since 1986 has been collected at 91% of the sampled sites in the Bay, constituting up to 93% of the foraminiferal assemblage at...
Authors
M. McGann, D. Sloan, A.N. Cohen
Benthic foraminifers in the regional monitoring program’s San Francisco Estuary samples Benthic foraminifers in the regional monitoring program’s San Francisco Estuary samples
For over three decades, sand-sized protozoans known as foraminifers have made contributions to our understanding of environmental problems in urban areas (Alve, 1991; Clark, 1971; Ellison et al., 1986; Watkins, 1961). Benthic foraminiferal assemblages are particularly sensitive pollution indicators in estuarine and coastal areas (Alve, 1995) because they vary spatially and temporally in...
Authors
Mary McGann, Doris Sloan
Ventilation changes in the northeast Pacific during the last deglaciation Ventilation changes in the northeast Pacific during the last deglaciation
Under present climate conditions, convection at high latitudes of the North Pacific is restricted to shallower depths than in the North Atlantic. To what extent this asymmetry between the two ocean basins was maintained over the past 20 kyr is poorly known because there are few unambiguous proxy records of ventilation from the North Pacific. We present new data for two sediment cores...
Authors
A. VanGeen, R.G. Fairbanks, P. Dartnell, M. McGann, J.V. Gardner, Michaele Kashgarian
Recent introduction of the foraminifer Trochammina hadai Uchio into San Francisco Bay, California, USA Recent introduction of the foraminifer Trochammina hadai Uchio into San Francisco Bay, California, USA
No abstract available.
Authors
Mary McGann, Doris Sloan
Science and Products
Filter Total Items: 15
No Result Found
Filter Total Items: 75
Interferometric Sidescan Bathymetry, Sediment and Foraminiferal Analyses; a New Look at Tomales Bay, California Interferometric Sidescan Bathymetry, Sediment and Foraminiferal Analyses; a New Look at Tomales Bay, California
The United States Geological Survey (USGS) in collaboration with Point Reyes National Sea Shore (PRNS), and the Tomales Bay Watershed Council [http://www.tomalesbaywatershed.org/] has completed a detailed bathymetric survey, and sediment and foraminiferal analyses of the floor of Tomales Bay, California. The study goals are to detail the submarine morphology, the sediment distribution
Authors
Roberto Anima, John L. Chin, David Finlayson, Mary McGann, Florence Wong
High-resolution foraminiferal, isotopic, and trace element records from holocene estuarine deposits of San Francisco Bay, California High-resolution foraminiferal, isotopic, and trace element records from holocene estuarine deposits of San Francisco Bay, California
A 3.5-m gravity core (DJ6-93SF-6) from San Francisco Bay reveals a complex paleoclimatic history of the region over the last 3870 cal YBP. A polynomial equation based on 11 AMS 14C ages provides an excellent age model for the core, and environmental proxies for water temperature and salinity are derived from various foraminiferal abundances, stable carbon and oxygen isotopes, and Mg/Ca...
Authors
M. McGann
Geomorphological, depositional, and foraminiferal indicators of late Quaternary tectonic uplift in Iskenderun Bay, Turkey Geomorphological, depositional, and foraminiferal indicators of late Quaternary tectonic uplift in Iskenderun Bay, Turkey
Iskenderun Bay is a major shallow embayment in the eastern part of the Mediterranean Sea, where the African and Anatolian Plates converge. This tectonically active basin was investigated for oceanographic, sedimentological, geochemical, and foraminiferal parameters. On the basis of the data acquired, the distribution of living and fossil foraminifera in 284 grab and 54 gravity core...
Authors
Valentina Yanko-Hombach, H. Koral, Niyazi Avsar, Irena Motnenko, Mary McGann
Age of Palos Verdes submarine debris avalanche, southern California Age of Palos Verdes submarine debris avalanche, southern California
The Palos Verdes debris avalanche is the largest, by volume, late Quaternary mass-wasted deposit recognized from the inner California Borderland basins. Early workers speculated that the sediment failure giving rise to the deposit is young, taking place well after sea level reached its present position. A newly acquired, closely-spaced grid of high-resolution, deep-tow boomer profiles of...
Authors
W. Normark, M. McGann, R. Sliter
Late Quaternary deposition in the inner basins of the California continental borderland — Part A. Santa Monica Basin Late Quaternary deposition in the inner basins of the California continental borderland — Part A. Santa Monica Basin
Radiocarbon dating of sediment core samples from Santa Monica Basin document Holocene (younger than approximately 11 ka) landslides and fault offsets along the basin margin. The new dates include 17 from six piston cores on the continental slope and 11 from Ocean Drilling Program Site 1015 on the basin floor. The dates, which are based on data from pelagic and benthic foraminifera in...
Authors
William Normark, Mary McGann
Response of benthic foraminifers to sewage discharge and remediation in Santa Monica Bay, California Response of benthic foraminifers to sewage discharge and remediation in Santa Monica Bay, California
Examination of a time series of foraminiferal assemblage distributions on the continental shelf and slope of Santa Monica Bay from 1955 to 1997-1998 suggests that the benthic microfauna have been greatly affected by the quality and character of the municipal sludge and wastewater discharged into the bay over the last half-century by the Hyperion Treatment Plant serving the greater Los...
Authors
M. McGann, C. Alexander, S.M. Bay
Historical and modern distributions of benthic foraminifers on the continental shelf of Monterey Bay, California Historical and modern distributions of benthic foraminifers on the continental shelf of Monterey Bay, California
Historical (early 1930s) and modern samples provide a detailed account of the spatial distribution of benthic foraminifers on the continental shelf of Monterey Bay, California. Ten species among a total of 110 present dominated the 110 samples investigated in the historical study. A cluster analysis of the foraminiferal abundances in the historical study identified five assemblages...
Authors
M. McGann
Invasion by a Japanese marine microorganism in western North America Invasion by a Japanese marine microorganism in western North America
The earliest record in western North America of Trochammina hadai Uchio, a benthic foraminifer common in Japanese estuaries, is from sediment collected in Puget Sound in 1971. It was first found in San Francisco Bay in sediment samples taken in 1983, and since 1986 has been collected at 91% of the sampled sites in the Bay, constituting up to 93% of the foraminiferal assemblage at...
Authors
M. McGann, D. Sloan, A.N. Cohen
Benthic foraminifers in the regional monitoring program’s San Francisco Estuary samples Benthic foraminifers in the regional monitoring program’s San Francisco Estuary samples
For over three decades, sand-sized protozoans known as foraminifers have made contributions to our understanding of environmental problems in urban areas (Alve, 1991; Clark, 1971; Ellison et al., 1986; Watkins, 1961). Benthic foraminiferal assemblages are particularly sensitive pollution indicators in estuarine and coastal areas (Alve, 1995) because they vary spatially and temporally in...
Authors
Mary McGann, Doris Sloan
Ventilation changes in the northeast Pacific during the last deglaciation Ventilation changes in the northeast Pacific during the last deglaciation
Under present climate conditions, convection at high latitudes of the North Pacific is restricted to shallower depths than in the North Atlantic. To what extent this asymmetry between the two ocean basins was maintained over the past 20 kyr is poorly known because there are few unambiguous proxy records of ventilation from the North Pacific. We present new data for two sediment cores...
Authors
A. VanGeen, R.G. Fairbanks, P. Dartnell, M. McGann, J.V. Gardner, Michaele Kashgarian
Recent introduction of the foraminifer Trochammina hadai Uchio into San Francisco Bay, California, USA Recent introduction of the foraminifer Trochammina hadai Uchio into San Francisco Bay, California, USA
No abstract available.
Authors
Mary McGann, Doris Sloan