Mary McGann (Former Employee)
Science and Products
Filter Total Items: 15
Invertebrate remains from the Dominican University of California archaeological site MRN-CA-254, Marin County, California
This data release indicates faunal presence or absence of shelly artifacts (invertebrate remains) from the Dominican University of California archaeological site MRN-CA-254, Marin County, California.
Sediment core data from the northern flank of Monterey Canyon, offshore California
The five files included in this U.S. Geological Survey data release are data from a set of sediment cores acquired from the continental slope, north of Monterey Canyon, offshore central California. Vibracores and push cores were collected with the Monterey Bay Aquarium Research Institutes remotely operated vehicle (ROV) Doc Ricketts in 2014 (cruise ID 2014-615-FA). One spreadsheet...
Sediment core data from offshore Palos Verdes, California
The seven files included in this U.S. Geological Survey data release are data from a set of sediment cores acquired from the continental slope, offshore Los Angeles and the Palos Verdes Peninsula, adjacent to the Palos Verdes Fault. Gravity cores were collected by the USGS in 2009 (cruise ID S-I2-09-SC; http://cmgds.marine.usgs.gov/fan_info.php?fan=SI209SC), and vibracores were collected...
Filter Total Items: 73
Potential use of the benthic foraminifers Bulimina denudata and Eggerelloides advenus in marine sediment toxicity testing
The benthic foraminifers Bulimina denudata and Eggerelloides advenus are commonly abundant in offshore regions in the Pacific Ocean, especially in waste-discharge sites. The relationship between their abundance and standard macrofaunal sediment toxicity tests (amphipod survival and sea urchin fertilization) as well as sediment chemistry analyte measurements were determined for sediments...
Authors
Mary McGann
Preconditioning by sediment accumulation can produce powerful turbidity currents without major external triggers
Turbidity currents dominate sediment transfer into the deep ocean, and can damage critical seabed infrastructure. It is commonly inferred that powerful turbidity currents are triggered by major external events, such as storms, river floods, or earthquakes. However, basic models for turbidity current triggering remain poorly tested, with few studies accurately recording precise flow...
Authors
Lewis Bailey, Michael Clare, Kurt J. Rosenberger, Matthieu J.B. Cartigny, Peter J. Talling, Charles K. Paull, Roberto Gwiazda, Daniel R. Parsons, Stephen M. Simmons, Jingping Xu, Ivan Haigh, Katherine L. Maier, Mary McGann, Eve M. Lundsten
Focused fluid flow and methane venting along the Queen Charlotte fault, offshore Alaska (USA) and British Columbia (Canada)
Fluid seepage along obliquely deforming plate boundaries can be an important indicator of crustal permeability and influence on fault-zone mechanics and hydrocarbon migration. The ~850-km-long Queen Charlotte fault (QCF) is the dominant structure along the right-lateral transform boundary that separates the Pacific and North American tectonic plates offshore southeastern Alaska (USA) and...
Authors
Nancy Prouty, Daniel Brothers, Jared W. Kluesner, J. Vaughn Barrie, Brian D. Andrews, Rachel Lauer, Gary H. Greene, James Conrad, Thomas Lorenson, Michael D. Law, Diana Sahy, Kim Conway, Mary McGann, Peter Dartnell
What determines the downstream evolution of turbidity currents?
Seabed sediment flows called turbidity currents form some of the largest sediment accumulations, deepest canyons and longest channel systems on Earth. Only rivers transport comparable sediment volumes over such large areas; but there are far fewer measurements from turbidity currents, ensuring they are much more poorly understood. Turbidity currents differ fundamentally from rivers, as...
Authors
Catharina Heerema, Peter J. Talling, Matthieu J.B. Cartigny, Charles K. Paull, Lewis Bailey, Stephen M. Simmons, Daniel R. Parsons, Michael Clare, Roberto Gwiazda, Eve M. Lundsten, Krystle Anderson, Katherine L. Maier, Jingping Xu, Esther J. Sumner, Kurt J. Rosenberger, Jenny Gales, Mary McGann, Lionel Carter, Ed Pope
Shallow-water foraminifera and other microscopic biota of Clipperton Island, tropical eastern Pacific
The recent foraminiferal fauna and associated microbiota of Clipperton Island (10.2833°N, 109.2167°W) were investigated at 20 sites collected in the intertidal zone around the perimeter of the island and from the edge of the inner brackish-water lagoon. Due to the island’s geographic location in a low productivity zone, a lack of variable habitats on and surrounding the island, and heavy...
Authors
Mary McGann, Robert W Schmieder, Louis-Philippe Loncke
A ship's ballasting history as an indicator of foraminiferal invasion potential--An example from Prince William Sound, Alaska, USA
We investigated the potential role of ballast sediment from coastal and transoceanic oil tankers arriving and de-ballasting in Port Valdez as a vector for the introduction of invasive benthic foraminifera in Prince William Sound, Alaska. Forty-one ballast sediment samples were obtained in 1998-1999 from 11 oil tankers that routinely discharged their ballast in Prince William Sound after...
Authors
Mary McGann, Gregory M. Ruiz, Anson H. Hines, George Otis Smith
Sediment and organic carbon transport and deposition driven by internal tides along Monterey Canyon, offshore California
Submarine canyons provide globally important conduits for sediment and organic carbon transport into the deep-sea. Using a novel dataset from Monterey Canyon, offshore central California, that includes an extensive array of water column sampling devices, we address how fine-grained sediment and organic carbon are transported, mixed, fractionated, and buried along a submarine canyon...
Authors
Katherine L. Maier, Kurt J. Rosenberger, Charles K. Paull, Roberto Gwiazda, Jenny Gales, Thomas Lorenson, James J. Barry, Peter J. Talling, Mary McGann, Jingping Xu, Eve M. Lundsten, Krystle Anderson, Steven Litvin, Daniel R. Parsons, Michael Clare, Stephen M. Simmons, Esther J. Sumner, Matthieu J.B. Cartigny
Linking direct measurements of turbidity currents to submarine canyon-floor deposits
Submarine canyons are conduits for episodic and powerful sediment density flows (commonly called turbidity currents) that move globally significant amounts of terrestrial sediment and organic carbon into the deep sea, forming some of the largest sedimentary deposits on Earth. The only record available for most turbidity currents is the deposit they leave behind. Therefore, to understand...
Authors
Katherine L. Maier, Jenny Gales, Charles K. Paull, Kurt J. Rosenberger, Peter J. Talling, Stephen M. Simmons, Roberto Gwiazda, Mary McGann, Matthieu J.B. Cartigny, Eve M. Lundsten, Krystle Anderson, Michael Clare, Jingping Xu, Daniel R. Parsons, James J. Barry, Monica Wolfson-Schwher, Nora Maria Nieminski, Esther J. Sumner
Discovery of an extensive deep-sea fossil serpulid reef associated with a cold seep, Santa Monica Basin, California
Multi-beam mapping of the Santa Monica Basin in the eastern Pacific has revealed the existence of a number of elevated bathymetric features, or mounds, harboring cold seep communities. During 2013-2014, mounds at ~600 m water depth were observed for the first time and sampled by Monterey Bay Aquarium Research Institute’s ROV Doc Ricketts. Active cold seeps were found, but surprisingly...
Authors
Magdalena N Georgieva, Charles K. Paull, Crispin TS Little, Mary McGann, Diana Sahy, Daniel Condon, Lonny Lundsten, Jack Pewsey, David W. Caress, Robert C Vrijenhoek
Initial dispersal (1986-1987) of the invasive foraminifera Trochammina hadai Uchio in San Francisco Bay, California, USA
A time series of three closely-spaced data sets are used to track the early expansion of the invasive Japanese benthic foraminifera Trochammina hadai in the southern portion of San Francisco Bay known as South Bay. The species initially appeared in 1983, comprising only 1.5% of the assemblage in one of four samples that were dominated by the native species Ammonia tepida and...
Authors
Mary McGann
The occurrence of the invasive foraminifera Trochammina hadai Uchio in Flamengo Inlet, Ubatuba, São Paulo State, Brazil
The agglutinated foraminifera Trochammina hadai Uchio (1962), a dominant species in Japan, first appeared as an invasive species in San Francisco Bay, US, in 1983. Trochammina hadai's first appearance in the Brazilian coastal waters of Flamengo Inlet, Ubatuba, Sao Paulo State, is recorded nearly three decades later, in two of thirty-four sediment samples collected in the western portion...
Authors
Patricia P. B. Eichler, Mary McGann, Andre R. Rodrigues, Alison Mendonca, Audrey Amorim, Carla Bonetti, Cristiane Cordeito de Farias, Silvia H. Mello e Sousa, Helenice Vital, Moab Praxedes Gomes
Powerful turbidity currents driven by dense basal layers
Seafloor sediment flows (turbidity currents) are among the volumetrically most important yet least documented sediment transport processes on Earth. A scarcity of direct observations means that basic characteristics, such as whether flows are entirely dilute or driven by a dense basal layer, remain equivocal. Here we present the most detailed direct observations yet from oceanic...
Authors
C. K. Paull, Peter J. Talling, Katherine L. Maier, Daniel R. Parsons, Jingping Xu, D. W. Caress, Roberto Gwiazda, E. Lundsten, K. H. Anderson, James J. Barry, M. Chaffey, T. O'Reilly, Kurt J. Rosenberger, Jenny Gales, Brian Kieft, Mary McGann, Samantha E. Simmons, M. McCann, Esther J. Sumner, M. A. Clare, M. J. Cartigny
Science and Products
Filter Total Items: 15
Invertebrate remains from the Dominican University of California archaeological site MRN-CA-254, Marin County, California
This data release indicates faunal presence or absence of shelly artifacts (invertebrate remains) from the Dominican University of California archaeological site MRN-CA-254, Marin County, California.
Sediment core data from the northern flank of Monterey Canyon, offshore California
The five files included in this U.S. Geological Survey data release are data from a set of sediment cores acquired from the continental slope, north of Monterey Canyon, offshore central California. Vibracores and push cores were collected with the Monterey Bay Aquarium Research Institutes remotely operated vehicle (ROV) Doc Ricketts in 2014 (cruise ID 2014-615-FA). One spreadsheet...
Sediment core data from offshore Palos Verdes, California
The seven files included in this U.S. Geological Survey data release are data from a set of sediment cores acquired from the continental slope, offshore Los Angeles and the Palos Verdes Peninsula, adjacent to the Palos Verdes Fault. Gravity cores were collected by the USGS in 2009 (cruise ID S-I2-09-SC; http://cmgds.marine.usgs.gov/fan_info.php?fan=SI209SC), and vibracores were collected...
Filter Total Items: 73
Potential use of the benthic foraminifers Bulimina denudata and Eggerelloides advenus in marine sediment toxicity testing
The benthic foraminifers Bulimina denudata and Eggerelloides advenus are commonly abundant in offshore regions in the Pacific Ocean, especially in waste-discharge sites. The relationship between their abundance and standard macrofaunal sediment toxicity tests (amphipod survival and sea urchin fertilization) as well as sediment chemistry analyte measurements were determined for sediments...
Authors
Mary McGann
Preconditioning by sediment accumulation can produce powerful turbidity currents without major external triggers
Turbidity currents dominate sediment transfer into the deep ocean, and can damage critical seabed infrastructure. It is commonly inferred that powerful turbidity currents are triggered by major external events, such as storms, river floods, or earthquakes. However, basic models for turbidity current triggering remain poorly tested, with few studies accurately recording precise flow...
Authors
Lewis Bailey, Michael Clare, Kurt J. Rosenberger, Matthieu J.B. Cartigny, Peter J. Talling, Charles K. Paull, Roberto Gwiazda, Daniel R. Parsons, Stephen M. Simmons, Jingping Xu, Ivan Haigh, Katherine L. Maier, Mary McGann, Eve M. Lundsten
Focused fluid flow and methane venting along the Queen Charlotte fault, offshore Alaska (USA) and British Columbia (Canada)
Fluid seepage along obliquely deforming plate boundaries can be an important indicator of crustal permeability and influence on fault-zone mechanics and hydrocarbon migration. The ~850-km-long Queen Charlotte fault (QCF) is the dominant structure along the right-lateral transform boundary that separates the Pacific and North American tectonic plates offshore southeastern Alaska (USA) and...
Authors
Nancy Prouty, Daniel Brothers, Jared W. Kluesner, J. Vaughn Barrie, Brian D. Andrews, Rachel Lauer, Gary H. Greene, James Conrad, Thomas Lorenson, Michael D. Law, Diana Sahy, Kim Conway, Mary McGann, Peter Dartnell
What determines the downstream evolution of turbidity currents?
Seabed sediment flows called turbidity currents form some of the largest sediment accumulations, deepest canyons and longest channel systems on Earth. Only rivers transport comparable sediment volumes over such large areas; but there are far fewer measurements from turbidity currents, ensuring they are much more poorly understood. Turbidity currents differ fundamentally from rivers, as...
Authors
Catharina Heerema, Peter J. Talling, Matthieu J.B. Cartigny, Charles K. Paull, Lewis Bailey, Stephen M. Simmons, Daniel R. Parsons, Michael Clare, Roberto Gwiazda, Eve M. Lundsten, Krystle Anderson, Katherine L. Maier, Jingping Xu, Esther J. Sumner, Kurt J. Rosenberger, Jenny Gales, Mary McGann, Lionel Carter, Ed Pope
Shallow-water foraminifera and other microscopic biota of Clipperton Island, tropical eastern Pacific
The recent foraminiferal fauna and associated microbiota of Clipperton Island (10.2833°N, 109.2167°W) were investigated at 20 sites collected in the intertidal zone around the perimeter of the island and from the edge of the inner brackish-water lagoon. Due to the island’s geographic location in a low productivity zone, a lack of variable habitats on and surrounding the island, and heavy...
Authors
Mary McGann, Robert W Schmieder, Louis-Philippe Loncke
A ship's ballasting history as an indicator of foraminiferal invasion potential--An example from Prince William Sound, Alaska, USA
We investigated the potential role of ballast sediment from coastal and transoceanic oil tankers arriving and de-ballasting in Port Valdez as a vector for the introduction of invasive benthic foraminifera in Prince William Sound, Alaska. Forty-one ballast sediment samples were obtained in 1998-1999 from 11 oil tankers that routinely discharged their ballast in Prince William Sound after...
Authors
Mary McGann, Gregory M. Ruiz, Anson H. Hines, George Otis Smith
Sediment and organic carbon transport and deposition driven by internal tides along Monterey Canyon, offshore California
Submarine canyons provide globally important conduits for sediment and organic carbon transport into the deep-sea. Using a novel dataset from Monterey Canyon, offshore central California, that includes an extensive array of water column sampling devices, we address how fine-grained sediment and organic carbon are transported, mixed, fractionated, and buried along a submarine canyon...
Authors
Katherine L. Maier, Kurt J. Rosenberger, Charles K. Paull, Roberto Gwiazda, Jenny Gales, Thomas Lorenson, James J. Barry, Peter J. Talling, Mary McGann, Jingping Xu, Eve M. Lundsten, Krystle Anderson, Steven Litvin, Daniel R. Parsons, Michael Clare, Stephen M. Simmons, Esther J. Sumner, Matthieu J.B. Cartigny
Linking direct measurements of turbidity currents to submarine canyon-floor deposits
Submarine canyons are conduits for episodic and powerful sediment density flows (commonly called turbidity currents) that move globally significant amounts of terrestrial sediment and organic carbon into the deep sea, forming some of the largest sedimentary deposits on Earth. The only record available for most turbidity currents is the deposit they leave behind. Therefore, to understand...
Authors
Katherine L. Maier, Jenny Gales, Charles K. Paull, Kurt J. Rosenberger, Peter J. Talling, Stephen M. Simmons, Roberto Gwiazda, Mary McGann, Matthieu J.B. Cartigny, Eve M. Lundsten, Krystle Anderson, Michael Clare, Jingping Xu, Daniel R. Parsons, James J. Barry, Monica Wolfson-Schwher, Nora Maria Nieminski, Esther J. Sumner
Discovery of an extensive deep-sea fossil serpulid reef associated with a cold seep, Santa Monica Basin, California
Multi-beam mapping of the Santa Monica Basin in the eastern Pacific has revealed the existence of a number of elevated bathymetric features, or mounds, harboring cold seep communities. During 2013-2014, mounds at ~600 m water depth were observed for the first time and sampled by Monterey Bay Aquarium Research Institute’s ROV Doc Ricketts. Active cold seeps were found, but surprisingly...
Authors
Magdalena N Georgieva, Charles K. Paull, Crispin TS Little, Mary McGann, Diana Sahy, Daniel Condon, Lonny Lundsten, Jack Pewsey, David W. Caress, Robert C Vrijenhoek
Initial dispersal (1986-1987) of the invasive foraminifera Trochammina hadai Uchio in San Francisco Bay, California, USA
A time series of three closely-spaced data sets are used to track the early expansion of the invasive Japanese benthic foraminifera Trochammina hadai in the southern portion of San Francisco Bay known as South Bay. The species initially appeared in 1983, comprising only 1.5% of the assemblage in one of four samples that were dominated by the native species Ammonia tepida and...
Authors
Mary McGann
The occurrence of the invasive foraminifera Trochammina hadai Uchio in Flamengo Inlet, Ubatuba, São Paulo State, Brazil
The agglutinated foraminifera Trochammina hadai Uchio (1962), a dominant species in Japan, first appeared as an invasive species in San Francisco Bay, US, in 1983. Trochammina hadai's first appearance in the Brazilian coastal waters of Flamengo Inlet, Ubatuba, Sao Paulo State, is recorded nearly three decades later, in two of thirty-four sediment samples collected in the western portion...
Authors
Patricia P. B. Eichler, Mary McGann, Andre R. Rodrigues, Alison Mendonca, Audrey Amorim, Carla Bonetti, Cristiane Cordeito de Farias, Silvia H. Mello e Sousa, Helenice Vital, Moab Praxedes Gomes
Powerful turbidity currents driven by dense basal layers
Seafloor sediment flows (turbidity currents) are among the volumetrically most important yet least documented sediment transport processes on Earth. A scarcity of direct observations means that basic characteristics, such as whether flows are entirely dilute or driven by a dense basal layer, remain equivocal. Here we present the most detailed direct observations yet from oceanic...
Authors
C. K. Paull, Peter J. Talling, Katherine L. Maier, Daniel R. Parsons, Jingping Xu, D. W. Caress, Roberto Gwiazda, E. Lundsten, K. H. Anderson, James J. Barry, M. Chaffey, T. O'Reilly, Kurt J. Rosenberger, Jenny Gales, Brian Kieft, Mary McGann, Samantha E. Simmons, M. McCann, Esther J. Sumner, M. A. Clare, M. J. Cartigny