Congaree National Park, South Carolina - Fixed

[ItoErika]

Info

Name: Congaree National Park, South Carolina

Source URL: https://catalog.data.gov/dataset/digital-geologic-map-of-congaree-national-park-and-vicinity-south-carolina-nps-grd-gri-cong-con

Estimated scale: medium?

Number of bedrock polygons: 6,708

Lithology field: Description

Time field: age

Stratigraphy name field: GLG_Name

Description field: mj_lith

Comments field:

Comments:

1) The PDF containing of lithology descriptions provided multiple descriptions for many of the units. Some of them had two to five separate descriptions that seemed to apply to different map quadrangles. I joined all of the descriptions for each unit into the attributes table of the geology shape file just to be safe.

Todo:

• [x] Insert new source record
• [x] Add data to database
• [x] Process and add to homogenized tables
• [x] Match
• [x] Roll tiles
• [x] Process and import lines

[cambro]

This looks like a good map, but these data also have truncated descriptions. I recommend a full stop in any new map additions until this problem is fixed in the workflow.

[cambro]

For example this is the description for the "Duplin Formation":

"Duplin Formation (Pliocene) ? Similarities between the position, stratigraphy and sedimentology, and geomorphology of the uppermost terrace in the Congaree River Valley terrace complex and the Duplin Formation in the nearby Fort Motte 7.5-minute quasar"

On a related note, if there are other fields that have the Name (Duplin Formation) and age (Pliocene) then these should be left out of the description if possible.

[ItoErika]

I kept the names and ages in the descriptions in this case because there were multiple descriptions that seemed to be associated with different map quadrangles for many of the individual units. Some of the unit ages for the separate descriptions differed slightly. I thought keeping the names also helped to create a more clear break between the separate descriptions. I can still edit the csv of descriptions and remove the names and ages if that would be better.

Let me know what you think would be best, and I will hold off on this one for now.

Here is an example of one of the units with multiple descriptions with differing ages:

Carolina bays (Pleistocene) – Undisturbed Carolina bays are elliptical depressions containing 3-5 feet of variably gray to black sandy clay to clayey quartz sand and surrounded by an eolian sand rim. Bays, which commonly have the primary (long) axis oriented north-northwest, are periglacial features formed over time by the action of dominant southwesterly winds on ponded water and dry land under conditions of fluctuating ground water (Kaczorowski, 1976, 1977; Soller and Mills, 1991; Brooks and others, 1996). Most bays are a minimum of Wisconsonian in age, though an Illinoian age (100-200 ka) for onset of bay formation is consistent with regional stratigraphic occurrence (Soller and Mills, 1991). A few rare cases of overlapping bays on the Congaree River Valley terrace complex indicate multiple periods of formation; lateral contacts and relative ages in these areas have not been confidently determined. Bays have been modified by climate changes in the Holocene and, today are important seasonal depressional wetlands (Brooks and others, 1996; Sharitz, 2003). The vast majority of bays have been plowed, ditched, or filled in during land development, such that many have been virtually erased. Because of this, most bays have been remotely mapped by using a combination of DOQQs, LIDAR data (MD Atlantic Technologies, 2002a,b), and observations of artificial drainage networks. The few (<5%) that have been ground-truthed are commonly expressed as wetter areas with distinctly darker soils and differences in vegetation type. GRI Source Map IDs 7333 (Congaree Quadrangle), 7334 (Eastover Quadrangle), 74894 (Saylors Lake Quadrangle), 74892 (Wateree Quadrangle). Carolina bay deposits (Holocene to upper Pleistocene) – Light-gray to black, quartzose clay to clayey quartz and quartzose sand in lake beds; and quartzose sand in eolian rims of bays. Carolina bays formed by the action of dominant southwesterly winds on ponded water and dry land under conditions of fluctuating ground water (Kaczorowski, 1976, 1977). Maximum ages are poorly constrained, but carbonaceous sediment in a bay in Sumter County is older than the range of reliable radiocarbon dates (approximately 25,000 to 30,000 years; after Brooks and others, 2001). Outlines of Carolina bay deposits were determined by inspection and from topographic maps, aerial photographs, and soil maps (Gerald and Stuckey, 1976; Lawrence, 1963; DeFrancisco, 1988). GRI Source Map ID 7335 (Elloree Quadrangle). Carolina bay deposits (Holocene to upper Pleistocene) – Light gray to black, quartzose clay to clayey quartz sand; quartzose sand in lakebeds; and quartzose sand in eolian rims of bays. Carolina bays form(ed) by the action of dominant southwesterly winds on ponded water and dry land under conditions of fluctuating ground water (Kaczorowski, 1976, 1977). Maximum ages are poorly constrained, but carbonaceous sediment in a bay in Sumter County is older than the range of reliable radiocarbon dates (approximately 25,000 - 30,000 years, Brooks and others, 2001). Not labeled everywhere. GRI Source Map ID 5778 (Fort Motte Quadrangle). Carolina bays (Pleistocene) – Undisturbed Carolina bays are elliptical depressions containing 3 to 5 feet of variably gray to black sandy clay to clayey quartz sand and surrounded by an eolian sand rim. Bays, which commonly have the primary (long) axis oriented north-northwest, are periglacial features formed over time by the action of dominant southwesterly winds on ponded water and dry land under conditions of fluctuating ground water (Kaczorowski, 1976, 1977; Soller and Mills, 1991; Brooks and others, 1996). Most bays are a minimum of Wisconsonian in age, though an Illinoian age (100-200 ka) for onset of bay formation is consistent with regional stratigraphic occurrence (Soller and Mills, 1991). A few rare cases of overlapping bays on the Congaree River Valley terrace complex indicate multiple periods of formation; lateral contacts and relative ages in these areas have not been confidently determined. Bays have been modified by climate changes in the Holocene and, today are important seasonal depressional wetlands (Brooks and others, 1996; Sharitz, 2003). The vast majority of bays have been plowed, ditched, or filled in during land development, such that many have been virtually erased. Because of this, most bays have been remotely mapped by using a combination of DOQQs, LIDAR data (MD Atlantic Technologies, 2002a,b), and observations of artificial drainage networks. The few (<5%) that have been ground-truthed are commonly expressed as wetter areas with distinctly darker soils and differences in vegetation type. Remote sensing data indicate one bay within the modern Cedar Creek tributary valley (Qatv). Aerial photographs clearly show hydrologic deflections around a topographically-positive, oval-shaped feature with a long axis oriented north-northwest. This feature is interpreted to be an old Carolina bay that has been overprinted by tributary valley development. GRI Source Map ID 74893 (Gadsden Quadrangle). Carolina bay sediments (Holocene to upper Pleistocene) – Light-gray to black, quartzose clay to clayey quartz sand in lake beds; and quartzose sand in eolian rims of bays. Carolina bays formed by the action of dominant, southwesterly winds on ponded water and dry land under conditions of fluctuating ground water (Kaczorowski, 1976, 1977). Maximum ages are poorly constrained, but carbonaceous sediment in a bay in Sumter County is older than the range of reliable radiocarbon dates (older than approximately 25,000 to 30,000 years; after Brooks and others, 2001). Carolina bays on the Duplin Formation may have begun to form before the bays that overlie the fluvial sediments of Low Falls Landing. GRI Source Map ID 7336 (Lone Star Quadrangle). Carolina bay sediments (upper Pleistocene to Holocene) – Carolina bays contain light-gray to black, clayey quartz sand and organic-rich peat deposits in the lake beds and coarser quartz sand and granules in the eolian rims of bays. Carolina bays were formed by the action of prevailing southwesterly winds that scoured blowout-like deflations on the topographic surface of the regional landscape. Carolina bays occur on the Atlantic Coastal Plain from New Jersey to Florida but are most abundant between Georgia and North Carolina (Soller and Mills, 1991). Although the shape and orientation of Carolina bays can vary, the majority are ellipsoidal depressions, with the long axis oriented southeast and the elevated rim of the bay along the northwest margin of the depression. The eolian-dominated process that formed Carolina bays, probably occurred under various moisture regimes, whereby the Carolina bays seasonally and annually ranged between ponded and dry conditions dependent on fluctuating ground-water levels (Kaczorowski, 1976, 1977). The wetter conditions facilitated peat formation, and the drier periods are evidenced by charcoal fragments from episodic fires. Deposition of the elevated sand rim is likely to have resulted from the combination of two processes, waves lapping against the northwest margin and eolian dune formation. The Carolina bays in the Poinsett State Park Quadrangle have been masked by agriculture, but their form is still recognizable by their topographic depression, orientation, and soil-moisture conditions. Maximum ages are estimates from regional correlations, but carbonaceous sediment in a bay in Sumter County is older than the range of reliable radiocarbon dates (older than approximately 25,000 to 30,000 years; after Brooks and others, 2001). In the Poinsett State Park Quadrangle map the Carolina bays were formed on the surface of the Plioceneage Duplin Formation. GRI Source Map ID 75216 (Poinsett State Park Quadrangle).

[ItoErika]

Table is fixed and pushed to teststrata.

[ItoErika]

New points have been pushed to teststrata: GeologicObservationLocalities

[ItoErika]

Lines have been pushed. Updated shapefile is titled "Lines".