Michael A O'Neal
Biographic Data
| ID | 11036721 |
|---|---|
| NAME | Michael A O'Neal |
| GIVEN NAMES | Michael A |
| FAMILY NAME | O'Neal |
| SIGNATURE | NEAL M A O |
| AFFILIATIONS | Department of Geological Sciences University of Delaware Newark DE USA |
| VERIFIED | No |
| TOTAL WORKS | 5 |
| TOTAL CITATIONS | 8 |
| WORKS AS AUTHOR | 5 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 2003 |
| LATEST PUBLICATION YEAR | 2017 |
| H-INDEX | 1 |
Observations of the reduction in surface artifact frequency as a result of multimodal plowing
The frequency and distribution of plowzone artifacts are compared with the timing and duration of two plow modes at two study locales on the Delmarva Peninsula, United States. Our results indicate that historic moldboard plowing created a maximum plowzone of ca . 0.30 m, in which artifacts were retained over time. Later, soil‐conservative chisel plowing mixed the top ca . 0.15 m of soil, creating a shallow, minimum plowzone. With time and repeate…
Detecting recent changes in the areal extent of North Cascades glaciers, USA
We present an exhaustive spatial analysis using the geographic, geometric, and hypsometric characteristics of 742 North Cascades glaciers to evaluate changes in their areal extents over a half-century period. Our results indicate that, contrary to our initial expectations, glacier change throughout the study region cannot be explained readily by correlations in glacier location, size, or shape. Because of the large error attributable to annual va…
An Objective Approach to Defining Earthwork Geometries Using Subdecimeter Digital Elevation Models
A lligator M ound, a ca. 800‐year‐old effigy earthwork located in central O hio, lies within a 2000 m 2 area on the edge of a steeply sloping bluff. This earthwork, with a maximum local relief of approximately 1.5 m, blends into the underlying natural topography, complicating the extraction of measurements of its geometry. To overcome this limitation, a 5 cm × 5 cm gridded digital elevation model ( DEM ) of A lligator M ound was developed from 2,…
Modeling the natural degradation of earthworks
Stratigraphic, topographic, and ground‐penetrating radar data obtained from a ca. 1800‐year‐old embankment and adjacent ditch at the Hopewell Mound Group (Chillicothe, Ohio) are used to validate the archaeological application of a simple finite‐differences diffusion model employed frequently to assess geomorphic change in natural landscapes. Although diffusion models have been used to describe the topographic degradation of landforms in a variety…
A Rhizocarpon geographicum growth curve for the Cascade Range of Washington and northern Oregon, USA
Lichen thallus measurements from 22 surfaces of known age on Mount Baker, Mount Hood, and Mount Rainier are used to construct a regional Rhizocarpon geographicum growth curve for the Cascade Range of Washington and northern Oregon. Growth rates determined by measuring the largest thallus diameters on the same surfaces at Mount Rainier in 1976 and 2002 are used for comparison with lichenometric data from Mount Baker and Mount Hood. Similar lichen …
Modeling the natural degradation of earthworks
Stratigraphic, topographic, and ground‐penetrating radar data obtained from a ca. 1800‐year‐old embankment and adjacent ditch at the Hopewell Mound Group (Chillicothe, Ohio) are used to validate the archaeological application of a simple finite‐differences diffusion model employed frequently to assess geomorphic change in natural landscapes. Although diffusion models have been used to describe the topographic degradation of landforms in a variety…
Observations of the reduction in surface artifact frequency as a result of multimodal plowing
The frequency and distribution of plowzone artifacts are compared with the timing and duration of two plow modes at two study locales on the Delmarva Peninsula, United States. Our results indicate that historic moldboard plowing created a maximum plowzone of ca . 0.30 m, in which artifacts were retained over time. Later, soil‐conservative chisel plowing mixed the top ca . 0.15 m of soil, creating a shallow, minimum plowzone. With time and repeate…
A Rhizocarpon geographicum growth curve for the Cascade Range of Washington and northern Oregon, USA
Lichen thallus measurements from 22 surfaces of known age on Mount Baker, Mount Hood, and Mount Rainier are used to construct a regional Rhizocarpon geographicum growth curve for the Cascade Range of Washington and northern Oregon. Growth rates determined by measuring the largest thallus diameters on the same surfaces at Mount Rainier in 1976 and 2002 are used for comparison with lichenometric data from Mount Baker and Mount Hood. Similar lichen …
Modeling the natural degradation of earthworks
Stratigraphic, topographic, and ground‐penetrating radar data obtained from a ca. 1800‐year‐old embankment and adjacent ditch at the Hopewell Mound Group (Chillicothe, Ohio) are used to validate the archaeological application of a simple finite‐differences diffusion model employed frequently to assess geomorphic change in natural landscapes. Although diffusion models have been used to describe the topographic degradation of landforms in a variety…
An Objective Approach to Defining Earthwork Geometries Using Subdecimeter Digital Elevation Models
A lligator M ound, a ca. 800‐year‐old effigy earthwork located in central O hio, lies within a 2000 m 2 area on the edge of a steeply sloping bluff. This earthwork, with a maximum local relief of approximately 1.5 m, blends into the underlying natural topography, complicating the extraction of measurements of its geometry. To overcome this limitation, a 5 cm × 5 cm gridded digital elevation model ( DEM ) of A lligator M ound was developed from 2,…
Detecting recent changes in the areal extent of North Cascades glaciers, USA
We present an exhaustive spatial analysis using the geographic, geometric, and hypsometric characteristics of 742 North Cascades glaciers to evaluate changes in their areal extents over a half-century period. Our results indicate that, contrary to our initial expectations, glacier change throughout the study region cannot be explained readily by correlations in glacier location, size, or shape. Because of the large error attributable to annual va…
Observations of the reduction in surface artifact frequency as a result of multimodal plowing
The frequency and distribution of plowzone artifacts are compared with the timing and duration of two plow modes at two study locales on the Delmarva Peninsula, United States. Our results indicate that historic moldboard plowing created a maximum plowzone of ca . 0.30 m, in which artifacts were retained over time. Later, soil‐conservative chisel plowing mixed the top ca . 0.15 m of soil, creating a shallow, minimum plowzone. With time and repeate…
Geography (5 works) · Geology (3 works) · Geology and Paleoclimatology Research (3 works) · Mathematics (3 works) · Archaeological Research and Protection (2 works) · Archaeology and ancient environmental studies (2 works) · Cartography (2 works) · Earthworks (2 works) · Geology (2 works) · Geomorphology (2 works)