The Hebron 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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87° on Nov. 15, 2025, the hottest reading for this week of the year since 1946. Next is 84° in 2013.
Hebron’s center stands about 580 ft above sea level. Within three miles the land runs from 480 ft to 700 ft, a difference of 220 ft: rolling country.
Under the town center the state geologic map shows Eagle Ford Formation (black-shale, siltstone), from the Late Cretaceous, 66 to 100 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 56×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Marlstone, chalk. Age: Late Cretaceous, 66 to 100 million years old. About 10 mi of the line.
Black-shale, siltstone. Age: Late Cretaceous, 66 to 100 million years old. About 8 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 4 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
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 Hebron reaches Galveston Bay and the Gulf of America by way of Indian Creek, the Elm Fork Trinity and the Trinity: about 480 river miles.
Lake on the way: Woodlands Golf Course Lake.
270 miles of the trip are on the Trinity.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hebron; river miles along the main stem, rounded.
Hebron has a humid subtropical climate. Summer afternoons average 95° in August; winter nights fall to about 36° in January. About 42 inches of rain fall in a normal year.
Normals 1991–2020 and records since 1946 at Richardson, 7 miles east-southeast. NOAA, through RCC-ACIS.
