The Newcastle plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
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Newcastle’s center stands about 1,120 ft above sea level. Within three miles the land runs from 1,070 ft to 1,220 ft, a difference of 150 ft: gently rolling country. The highest named summit within 15 miles is Tackett Mountain, about 1,370 ft, 13 miles south.
Under the town center the state geologic map shows Markley Formation (sandstone), from the Carboniferous to Permian, 252 to 324 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone. Age: Carboniferous to Permian, 252 to 324 million years old. About 10 mi of the line.
Black-shale. Age: Carboniferous, 299 to 324 million years old. About 7 mi of the line.
Black-shale. Age: Permian, 252 to 299 million years old. About 3 mi of the line.
Sand. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Coarse-detrital, fine-detrital. Age: Quaternary, less than 2.6 million years old. About 1 mi of the line.
Sand. Age: Holocene, less than 12,000 years old. About 0.5 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit along the line are not listed.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
A raindrop that lands in Newcastle reaches the Gulf of America by way of Rattlesnake Creek and the Brazos: about 780 river miles.
Lakes on the way: Possum Kingdom Lake and Lake Granbury.
550 miles of the trip are on the Brazos.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Newcastle; river miles along the main stem, rounded.
