Sinkhole risk in Marion County, TX: Not karst, but voids possible

Not karst, but voids possible

No soluble bedrock; some pseudokarst (piping or lava-tube ground).

On soluble rock: 0%
At or near the surface: 0%
Buried under cover: 0%

What to do about a house in Marion County

Not true karst, but soil piping or lava tubes can still open voids - mention it to an inspector.

Across 381 square miles, under one square mile of Marion County maps onto soluble rock. With about 9,704 residents (25 per square mile), much of the land is open, and the mapped rock may sit far from where people actually live. The figures come from 351 map points about 1.0 miles apart, so a pocket smaller than that can be missed or overstated.

Counties around Marion County

The nearest county rated sinkhole country is Adair County, OK, about 215 miles north. 3 of the 6 closest counties land in the same band; the ground changes quickly around here.

Harrison County, TX 17 mi south · 0% at surface
Cass County, TX 20 mi north · 0% at surface
Morris County, TX 31 mi northwest · 0% at surface
Caddo Parish, LA 31 mi southeast · 0% at surface
Upshur County, TX 34 mi west · 0% at surface
Gregg County, TX 34 mi southwest · 0% at surface

Against the rest of Texas

Marion County ranks 211 of 254 in Texas for soluble rock at the surface, and sits above 0% of US counties on that measure.