# Jacobs Cavern

- **Country:** United States
- **Coordinates:** 36.590000, -94.340000
- **Depth:** 14 m
- **Length:** 21 m
- **Geology:** St. Joe Formation (Mississippian)
- **Location:** East of Pineville, McDonald County, Missouri, U.S.
- **Discovery:** 1903
- **Entrance Count:** 1

Jacobs Cavern is a small cave, hardly more than a rock shelter, and is entirely in the St. Joe Formation of the Mississippian subperiod. Its roof is a single flat stratum of limestone; its walls are well marked by lines of stratification; dripstone also partly covers the walls, fills a deep fissure at the end of the cave, and spreads over the floor, where it mingles with an ancient bed of ashes, forming an ash-breccia (mostly firm and solid) that encloses fragments of sandstone, flint spalls, flint implements, charcoal and bones. Underneath is the true floor of the cave, a mass of homogeneous yellow clay, one meter in thickness. It holds scattered fragments of limestone, and is itself the result of limestone degeneration. The length of the opening is over 21 meters; its depth 14 meters, and the height of roof above the undisturbed ash deposit varied from 1 m 20 cm to 2 m 60 cm The bone recess at the end was from 50 cm. to 80 cm. in height. The stratum of ashes was from 50 cm to 1 m 50 cm thick.

**Source:** https://en.wikipedia.org/wiki/Jacobs_Cavern (Wikipedia, CC BY-SA)