The Cabin Branch and Cabin Creek (Cappy Avenue) outcrops are located along two small creeks in Prince George’s County, Maryland. The Cabin Branch outcrop contains exposures of silty sands of the Upper Cretaceous Severn Formation, and both outcrops contain Paleocene silty quartz and glauconitic sands of the Danian Brightseat Formation and highly fossiliferous glauconitic quartz sands of the Selandian Aquia Formation. Data from these two locations were generated in order to designate a Principal Reference Section for the Danian age Brightseat Formation. The Cabin Branch outcrop consists of disjunct exposures along an approximately 0.4-mile section of the creek. At the nearby Cabin Creek (Cappy Avenue) outcrop a more complete Brightseat/Aquia contact is exposed. Data generated from these two outcrops include a complete suite of sand/silt/clay percent abundances from each sample of each formation. Additionally, data for the sand-size fraction from each formation were further broken down into percent abundance of very fine, fine, medium, and coarse components. Petrographic data for the indurated beds at the Cabin Branch outcrop are also included. Calcareous nannofossil data from the two outcrops are presented in three occurrence charts: one for the Late Cretaceous and one for the Paleocene at Cabin Branch, and one for the Brightseat-Aquia contact interval at Cabin Creek (Cappy Avenue). Calcareous nannofossil data were used to determine the ages and zonation of each formation, and species richness, a measure used to detail community stability, is also provided. In addition to calcareous nannofossil biostratigraphy, samples were processed for other calcareous microfossils: planktic and benthic foraminifera and ostracods. A table for each outcrop presents the number of planktic and benthic foraminifera per 300 specimens, along with the total number of ostracods present per sample. An occurrence chart of ostracod species is provided for both outcrops.

This data release includes data collected in the pursuit of identifying pre- and post-colonial riparian ecosystems found throughout Anne Arundel County, Maryland, USA. The single shapefile included documents the depths cored at both detailed study sites, and their spatial locations. Seventeen comma-delimited tables are included. Fourteen record pollen records at various depths identified within sediment cores taken at this study's two detailed investigation sites: Main Creek, near Pasadena, MD, and Bacon Ridge Branch, near Crownsville, MD. The remaining three include: radiocarbon dates associated with woody material identified in these sediment cores, visible, near-infrared, and X-ray Fluorescence (XRF) information associated with each sediment core respectively, and a data dictionary for the visible, near-infrared, and XRF data for clarity.

This data release includes data collected in the pursuit of identifying pre- and post-colonial riparian ecosystems found throughout Anne Arundel County, Maryland, USA. The single shapefile included documents the depths cored at both detailed study sites, and their spatial locations. Seventeen comma-delimited tables are included. Fourteen record pollen records at various depths identified within sediment cores taken at this study's two detailed investigation sites: Main Creek, near Pasadena, MD, and Bacon Ridge Branch, near Crownsville, MD. The remaining three include: radiocarbon dates associated with woody material identified in these sediment cores, visible, near-infrared, and X-ray Fluorescence (XRF) information associated with each sediment core respectively, and a data dictionary for the visible, near-infrared, and XRF data for clarity.

This data release includes data collected in the pursuit of identifying pre- and post-colonial riparian ecosystems found throughout Anne Arundel County, Maryland, USA. A single raster file is included, and represents a topological classification of the entire county according to a hydrologically conditioned Digital Elevation Model (DEM). Ten shapefiles are also included, nine of which represent the depths of various soil layers as identified by ground-penetrating radar for two detailed study sites within Anne Arundel County. A tenth documents the depths cored at both detailed study sites, and their spatial locations. Finally, twenty comma-delimited tables are included in this release with fifteen tables documenting pollen records at various depths identified within sediment samples taken throughout the country's flood plains. The remaining five tables include the following: general summary information for all sample sites; radiocarbon dates associated with woody material within the sediment cores; morphological information identifying tree species found buried in-situ throughout the county; visible, near-infrared, and X-Ray Fluorescence (XRF) information associated with each core; and a data dictionary for the previous information.

This data release includes data collected in the pursuit of identifying pre- and post-colonial riparian ecosystems found throughout Anne Arundel County, Maryland, USA. Two comma-delimited tables are included. The first documents pollen records at various depths identified within sediment samples taken throughout the county's floodplains. The other describes morphological information identifying tree species found buried in-situ throughout the county.

This data release includes data collected in the pursuit of identifying pre- and post-colonial riparian ecosystems found throughout Anne Arundel County, Maryland, USA. Two comma-delimited tables are included. The first documents pollen records at various depths identified within sediment samples taken throughout the county's floodplains. The other describes morphological information identifying tree species found buried in-situ throughout the county.

To aid in geologic studies of sediment transport and environmental change in coastal marsh, 1-centimeter (cm) foraminiferal subsamples were taken from seven sediment push cores collected in the Grand Bay National Estuarine Research Reserve (GNDNERR), Mississippi, in October 2016. The push cores were collected along two, shore-perpendicular transects at 5, 15, 25, and 50 meters (m) from the shoreline, on opposite sides of Middle Bay during U.S. Geological Survey (USGS) Field Activities Number (FAN) 2016-358-FA, also known as alternate FAN 16CCT07. Foraminiferal subsamples were processed and analyzed at the USGS St. Petersburg Coastal and Marine Science Center (SPCMSC). Sediment characteristics, loss-on-ignition (LOI), and site location information for the core sites can be found in Marot and others (2019; https://doi.org/10.5066/P9FO8R3Y). Downloadable data are available as Excel spreadsheets (.xlsx), comma-separated values text files (.csv), and Federal Geographic Data Committee (FGDC) metadata (.txt and .xml).

To aid in geologic studies of sediment transport and environmental change in coastal marsh, 1-centimeter (cm) foraminiferal subsamples were taken from seven sediment push cores collected in the Grand Bay National Estuarine Research Reserve (GNDNERR), Mississippi, in October 2016. The push cores were collected along two, shore-perpendicular transects at 5, 15, 25, and 50 meters (m) from the shoreline, on opposite sides of Middle Bay during U.S. Geological Survey (USGS) Field Activities Number (FAN) 2016-358-FA, also known as alternate FAN 16CCT07. Foraminiferal subsamples were processed and analyzed at the USGS St. Petersburg Coastal and Marine Science Center (SPCMSC). Sediment characteristics, loss-on-ignition (LOI), and site location information for the core sites can be found in Marot and others (2019; https://doi.org/10.5066/P9FO8R3Y). Downloadable data are available as Excel spreadsheets (.xlsx), comma-separated values text files (.csv), and Federal Geographic Data Committee (FGDC) metadata (.txt and .xml).

In October 2019, five marsh push cores (core names appended with M for marsh push core) and 18 surface sediment samples (top 1 cm of sediment) were collected from the estuary (sample name appended G for PONAR grab) near the mouth of the St. Marks River and some of the surrounding marshes (sample name appended with S for surface), along with elevation transects and peat augers (sample name appended with R or R50, depending on length, for Russian peat auger). The purpose of the study was to 1) evaluate peat thickness relative to the shoreline and upland, 2) compare marsh accretion rates with other marshes along the northern Gulf of Mexico, 3) determine whether sea-level or storm history records are recorded and viable, and 4) compare elevation and shoreline data with post-Michael lidar imagery. Cores and surficial sediment samples were processed and analyzed for organic content and grain-size. Cores and select surface samples were analyzed using gamma spectroscopy for determination of background and excess lead-210 with cesium-137, while the modern foraminiferal microfossil assemblage was determined using surface sediment samples. Foraminiferal samples (appended with F for foraminifera) were collected at surface sample sites and stained in the field with rose Bengal for determination of live (stained) and dead (unstained) microfossils. All samples in the dataset are referred to by field activity number (FAN) 2019-366-FA (alternate FAN 19CCT05) and are part of the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center's (USGS-SPCMSC) Estuarine and MaRsh Geology (EMRG) research project, which works to understand how and where short- and long-term marsh and estuarine coastal processes interact, how they influence coastal accretion or erosion, and how they pre-condition a marsh’s resiliency to storms, sea-level change, and human alterations along the northern Gulf of Mexico.

In October 2019, five marsh push cores (core names appended with M for marsh push core) and 18 surface sediment samples (top 1 cm of sediment) were collected from the estuary (sample name appended G for PONAR grab) near the mouth of the St. Marks River and some of the surrounding marshes (sample name appended with S for surface), along with elevation transects and peat augers (sample name appended with R or R50, depending on length, for Russian peat auger). The purpose of the study was to 1) evaluate peat thickness relative to the shoreline and upland, 2) compare marsh accretion rates with other marshes along the northern Gulf of Mexico, 3) determine whether sea-level or storm history records are recorded and viable, and 4) compare elevation and shoreline data with post-Michael lidar imagery. Cores and surficial sediment samples were processed and analyzed for organic content and grain-size. Cores and select surface samples were analyzed using gamma spectroscopy for determination of background and excess lead-210 with cesium-137, while the modern foraminiferal microfossil assemblage was determined using surface sediment samples. Foraminiferal samples (appended with F for foraminifera) were collected at surface sample sites and stained in the field with rose Bengal for determination of live (stained) and dead (unstained) microfossils. All samples in the dataset are referred to by field activity number (FAN) 2019-366-FA (alternate FAN 19CCT05) and are part of the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center's (USGS-SPCMSC) Estuarine and MaRsh Geology (EMRG) research project, which works to understand how and where short- and long-term marsh and estuarine coastal processes interact, how they influence coastal accretion or erosion, and how they pre-condition a marsh’s resiliency to storms, sea-level change, and human alterations along the northern Gulf of Mexico.