Jean M. Self-Trail Mercer Parker Kristina F. Gardner Gregory S. Gohn 20221013 spreadsheet https://doi.org/10.5066/P9E2JZCG Jean M. Self-Trail David L. Govoni Laurel M. Bybell Kristina F. Gardner 20230509 publication n/a Geological Society of America ppg. 1-20 https://doi.org/10.1130/2023.0065(01) 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. Differentiation between the Upper Cretaceous and Paleocene sediments has historically been difficult to determine in the Salisbury Embayment, despite the presence of a significant hiatus separating them. Similarities in sediment composition, a paucity of exposed outcrop material, significant burrowing, and weathering have all contributed to this difficulty. As part of the U.S. Geological Survey project Atlantic Subsurface Stratigraphic Initiative (ASSI), Upper Cretaceous and Paleogene deposits from classic localities in Maryland and Virginia, as well as from proposed new cores, are being examined with the goal of providing a regional context for Paleogene sedimentation in the Salisbury Embayment, especially as it pertains to aquifer studies across state boundaries. 20210406 20220614 observed Complete None planned -76.899533 -76.884212 38.880811 38.872058 ISO 19115 Topic Category biota geoscientificInformation Geologic Formations Aquia Formation Brightseat Formation Severn Formation USGS Thesaurus micropaleontology biostratigraphy calcareous nannoplankton protists fossils faunal and floral census (microscopic) stratigraphic sections stratigraphic thickness sedimentology ostracodes petrography lithostratigraphy Marine Realms Information Bank (MRIB) foraminiferans sediment analysis sediment deposition sediment Alexandria Digital Library Feature Type Thesaurus coastal zones continental margins USGS Metadata Identifier USGS:6342d2a3d34e342aee085bc0 Common Geographic Areas Maryland Prince George's Other Geographic Areas Mid-Atlantic Coastal Plain Salisbury Embayment USGS Thesaurus Cenozoic Tertiary Paleogene Paleocene Mesozoic Cretaceous Geologic Stages Maastrichtian Danian Selandian Thanetian None. Please see 'Distribution Info' for details. None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Jean M Self-Trail U.S. Geological Survey, Northeast Region Research Geologist mailing address

Mail Stop 926A, 12201 Sunrise Valley Dr

Reston VA 20192 US 703-648-6013 703-648-6953 jstrail@usgs.gov Microfossil identification, specimen counts, and petrography conducted manually with the aid of standard microscopes. Sediment grain size analysis conducted using a Beckman-Coulter LS 13320 Laser Diffraction Particle Size Analyzer. No formal attribute accuracy tests were conducted. Presence/absence, abundance, and identity of fossil species within samples is based upon expert examination and interpretation. Determination of sediment grain size and rock attributes is based upon expert examination and interpretation of laboratory and field data. No formal logical accuracy tests were conducted. Data sets are complete as presented. Information on location of the sample site and positional accuracy (horizontal/vertical) of samples within the site are based on a combination of GPS readings and direct measurements on outcrops. Information on location of the sample site and positional accuracy (horizontal/vertical) of samples within the site are based on a combination of GPS readings and direct measurements on outcrops. NA 20210406 Jean M Self-Trail U.S. Geological Survey, Northeast Region Research Geologist mailing address

Mail Stop 926A, 12201 Sunrise Valley Dr

Reston VA 20192 US 703-648-6013 703-648-6953 jstrail@usgs.gov U.S. Geological Survey GS ScienceBase mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P9E2JZCG None 20230601 Jean M Self-Trail U.S. Geological Survey, Northeast Region Research Geologist mailing address

Mail Stop 926A, 12201 Sunrise Valley Dr

Reston VA 20192 US 703-648-6013 703-648-6953 jstrail@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998