James C Knox
Biographic Data
| ID | 5232474 |
|---|---|
| NAME | James C Knox |
| GIVEN NAMES | James C |
| FAMILY NAME | Knox |
| SIGNATURE | KNOX J C |
| AFFILIATIONS | University of Wisconsin–Madison |
| VERIFIED | No |
| TOTAL WORKS | 8 |
| TOTAL CITATIONS | 90 |
| WORKS AS AUTHOR | 8 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 1972 |
| LATEST PUBLICATION YEAR | 2005 |
| H-INDEX | 3 |
Alluvial stratigraphic evidence for channel incision during the Mediaeval Warm Period on the central Great Plains, USA
Alluvial valley fills from tributaries to the upper Republican River, southwest Nebraska, USA, provide soil- and morpho-stratigraphic evidence for an episode of channel incision that occurred between c. 1100 and 800 14 C yr BP, based on 11 new radiocarbon ages. This local episode of channel incision correlates with other alluvial stratigraphic studies from the central Great Plains and demonstrates regionally synchronous fluvial behaviour. Proxy r…
Preservation and Recognition of Middle and Early Pleistocene Loess in the Driftless Area, Wisconsin
An exceptional stratigraphic and pedologic record of Pleistocene environmental conditions occurs at the Kieler Site in the Driftless Area of southwestern Wisconsin. Peoria, Roxana, Loveland, and pre-Loveland loesses overlie weathered bedrock residuum. The pre-Loveland unit previously has been included as part of the residuum at other Driftless Area sites. Early and middle Pleistocene loesses in the Mississippi Valley are normally absent at most l…
Loess of the Upper Mississippi Valley Driftless Area
Loess of the Driftless Area includes four distinct late Quaternary lithostratigraphic units: the Wyalusing (new), Loveland, Roxana, and Peoria formations. Erosion has removed parts or all of the pre-late Wisconsian loess at many sites. These formations consist largely of loess and retransported loess that typically occurs on uplands, terraces, and valley margins in the region. The oldest widespread formation (probably > 125,000 yr B.P.) is here f…
AMS Radiocarbon Age of the Upper Mississippi Valley Roxana Silt
Accelerator mass spectrometer radiocarbon ages of the Roxana Silt (loess) along the Upper Mississippi Valley of Wisconsin and Minnesota indicate that loess sedimentation of the Roxana Silt occurred between about 55,000 and 27,000 14 C yr B.P. However, due to local environmental controls, the basal age at any given site may range from 55,000 to 35,000 14 C yr B.P. The radiocarbon ages presented here are in agreement with previous radiocarbon ages …
Historical Valley Floor Sedimentation in the Upper Mississippi Valley
This research evaluates the response of floodplain sedimentation rates to post-1820 A.D. human activity in the Lead-Zinc district of the Upper Mississippi Valley. Although mine waste has contributed very minor amounts of sediment to historical overbank floodplain sedimentation that commonly is 30–50 cm deep on tributary floodplains to as much as 3–4 m deep on floodplains in the lower reaches of main valleys near the Mississippi River, it is well …
Responses of Floods to Holocene Climatic Change in the Upper Mississippi Valley
Dimensions of Holocene relict channels and sedimentological characteristics of point bars associated with these relict channels were used to reconstruct a Holocene history of long-term changes in magnitudes of 1.58-yr floods in Upper Mississippi Valley watersheds of southwestern Wisconsin. The reconstructed record of floods shows relatively large and persistent (nonrandom) departures from contemporary long-term average flood magnitudes. The flood…
Human Impacts on Wisconsin Stream Channels∗
The conversion of natural land cover to agricultural land uses in the Platte watershed of southwestern Wisconsin caused a three to fivefold increase in the magnitudes of floods that recur more frequently than once in five years in the small headwater and tributary watersheds. The impact of settlement on floods is less for larger watersheds, but the general impact of settlement has caused a major channel metamorphosis throughout the Platte River c…
Valley Alluviation in Southwestern Wisconsin∗
Meander erosional banks of fifth and sixth order southwestern Wisconsin streams having drainage areas of twenty square miles (30 km2) or less frequently reveal three distinct sedimentary sequences. The basal unit of coarse textured debris is thought to represent bed load sediment of a prior channel active near the terminus of a mid-Holocene drought about 6,000 years B. P. A silty clay series over the coarse layer is interpreted to have been deriv…
Historical Valley Floor Sedimentation in the Upper Mississippi Valley
This research evaluates the response of floodplain sedimentation rates to post-1820 A.D. human activity in the Lead-Zinc district of the Upper Mississippi Valley. Although mine waste has contributed very minor amounts of sediment to historical overbank floodplain sedimentation that commonly is 30–50 cm deep on tributary floodplains to as much as 3–4 m deep on floodplains in the lower reaches of main valleys near the Mississippi River, it is well …
Valley Alluviation in Southwestern Wisconsin∗
Meander erosional banks of fifth and sixth order southwestern Wisconsin streams having drainage areas of twenty square miles (30 km2) or less frequently reveal three distinct sedimentary sequences. The basal unit of coarse textured debris is thought to represent bed load sediment of a prior channel active near the terminus of a mid-Holocene drought about 6,000 years B. P. A silty clay series over the coarse layer is interpreted to have been deriv…
Human Impacts on Wisconsin Stream Channels∗
The conversion of natural land cover to agricultural land uses in the Platte watershed of southwestern Wisconsin caused a three to fivefold increase in the magnitudes of floods that recur more frequently than once in five years in the small headwater and tributary watersheds. The impact of settlement on floods is less for larger watersheds, but the general impact of settlement has caused a major channel metamorphosis throughout the Platte River c…
Alluvial stratigraphic evidence for channel incision during the Mediaeval Warm Period on the central Great Plains, USA
Alluvial valley fills from tributaries to the upper Republican River, southwest Nebraska, USA, provide soil- and morpho-stratigraphic evidence for an episode of channel incision that occurred between c. 1100 and 800 14 C yr BP, based on 11 new radiocarbon ages. This local episode of channel incision correlates with other alluvial stratigraphic studies from the central Great Plains and demonstrates regionally synchronous fluvial behaviour. Proxy r…
Valley Alluviation in Southwestern Wisconsin∗
Meander erosional banks of fifth and sixth order southwestern Wisconsin streams having drainage areas of twenty square miles (30 km2) or less frequently reveal three distinct sedimentary sequences. The basal unit of coarse textured debris is thought to represent bed load sediment of a prior channel active near the terminus of a mid-Holocene drought about 6,000 years B. P. A silty clay series over the coarse layer is interpreted to have been deriv…
Human Impacts on Wisconsin Stream Channels∗
The conversion of natural land cover to agricultural land uses in the Platte watershed of southwestern Wisconsin caused a three to fivefold increase in the magnitudes of floods that recur more frequently than once in five years in the small headwater and tributary watersheds. The impact of settlement on floods is less for larger watersheds, but the general impact of settlement has caused a major channel metamorphosis throughout the Platte River c…
Responses of Floods to Holocene Climatic Change in the Upper Mississippi Valley
Dimensions of Holocene relict channels and sedimentological characteristics of point bars associated with these relict channels were used to reconstruct a Holocene history of long-term changes in magnitudes of 1.58-yr floods in Upper Mississippi Valley watersheds of southwestern Wisconsin. The reconstructed record of floods shows relatively large and persistent (nonrandom) departures from contemporary long-term average flood magnitudes. The flood…
Historical Valley Floor Sedimentation in the Upper Mississippi Valley
This research evaluates the response of floodplain sedimentation rates to post-1820 A.D. human activity in the Lead-Zinc district of the Upper Mississippi Valley. Although mine waste has contributed very minor amounts of sediment to historical overbank floodplain sedimentation that commonly is 30–50 cm deep on tributary floodplains to as much as 3–4 m deep on floodplains in the lower reaches of main valleys near the Mississippi River, it is well …
AMS Radiocarbon Age of the Upper Mississippi Valley Roxana Silt
Accelerator mass spectrometer radiocarbon ages of the Roxana Silt (loess) along the Upper Mississippi Valley of Wisconsin and Minnesota indicate that loess sedimentation of the Roxana Silt occurred between about 55,000 and 27,000 14 C yr B.P. However, due to local environmental controls, the basal age at any given site may range from 55,000 to 35,000 14 C yr B.P. The radiocarbon ages presented here are in agreement with previous radiocarbon ages …
Loess of the Upper Mississippi Valley Driftless Area
Loess of the Driftless Area includes four distinct late Quaternary lithostratigraphic units: the Wyalusing (new), Loveland, Roxana, and Peoria formations. Erosion has removed parts or all of the pre-late Wisconsian loess at many sites. These formations consist largely of loess and retransported loess that typically occurs on uplands, terraces, and valley margins in the region. The oldest widespread formation (probably > 125,000 yr B.P.) is here f…
Preservation and Recognition of Middle and Early Pleistocene Loess in the Driftless Area, Wisconsin
An exceptional stratigraphic and pedologic record of Pleistocene environmental conditions occurs at the Kieler Site in the Driftless Area of southwestern Wisconsin. Peoria, Roxana, Loveland, and pre-Loveland loesses overlie weathered bedrock residuum. The pre-Loveland unit previously has been included as part of the residuum at other Driftless Area sites. Early and middle Pleistocene loesses in the Mississippi Valley are normally absent at most l…
Alluvial stratigraphic evidence for channel incision during the Mediaeval Warm Period on the central Great Plains, USA
Alluvial valley fills from tributaries to the upper Republican River, southwest Nebraska, USA, provide soil- and morpho-stratigraphic evidence for an episode of channel incision that occurred between c. 1100 and 800 14 C yr BP, based on 11 new radiocarbon ages. This local episode of channel incision correlates with other alluvial stratigraphic studies from the central Great Plains and demonstrates regionally synchronous fluvial behaviour. Proxy r…
Geography (7 works) · Geology (7 works) · Archaeology (6 works) · Geomorphology (6 works) · Paleontology (6 works) · Hydrology and Sediment Transport Processes (5 works) · Soil erosion and sediment transport (5 works) · Floodplain (4 works) · Geological formations and processes (4 works) · Geology (4 works)