FOWKE] ARCHEOLOGICAL INVESTIGATIONS 91 



or limestone blocks, and all are more or less torn up. So far as 

 could be learned there is no sign of a wall in any of them. 



In the present state of knowledge, Camden County offers no in- 

 ducement for archeological research. 



A FOSSIL CAVE (29) 



The geological deposits in this region comprise three principal 

 formations which are named in the State report as the Jefferson 

 City limestone, the Roubidoux sandstone, and the (lasconade lime- 

 stone. It is in the last (which is the lowest) that caverns are 

 found. 



In various places erosion, either internal or superficial, or both, 

 has formed crevices or sink holes through which the disintegrated 

 sandstone finds its way into caverns below, where it accumulates 

 and hardens until more resistant than when in its original condition. 



Further erosion has in several places carried away the limestone 

 from around these intrusive masses, allowing them to project above 

 the present surface. Sometimes, where the sand piled up, they 

 resemble haystacks; but usually the}' are of indefinite form, having 

 spread out on the floor of the cavern, as such material will do in a 

 shallow stream. 



An interesting example of this action is the " Standing Rock," 4 

 miles west of Linn Creek, the county seat. Here was formerly a 

 large cave with an eastward trend untih near the mouth, when it 

 turned sharply southward, the opening being in the direction of a 

 little stream. The lower end of this cave became solidly filled 

 with sand, and the water found an outlet farther back. All the 

 limestone which formed the roof and walls of the middle portion 

 of the cave is gone, a narrow ravine marking its course. The sand- 

 stone obstruction held its place, and now extends directly across 

 the ridge between the two ravines. Its surface is nn exact cast of 

 the interior of the cave which it filled, and nodules of chert, remain- 

 ing when the limestone dissolved, are still imbedded in its surface. 

 The line of demarkation between the limestone matrix, where this 

 still exists in part, and the siliceous filling is as distinct as that 

 between the stone and brick in a building. The loose cave earth 

 shows plainly under the sandstone near the former mouth of tlxe 

 cavern. Plan and section are shown in figures 20 and 21. 



MILLER COUNTY 



WRIGHT CAVE (30) 



A mile and a half west of Brumley, near Glaize Creek, is Wright, 

 or Brumley, Cave. The entrance is 15 feet high and 40 feet wide. 



