DE RANGE : THE VALE OF CLWYD CAVES, 
9 
The section he describes as consistiiior of : — 
3. 
4. 
Impalpable mud lamined, 1ft. Gin. to 2ft. Gin. 
Marl, or clay, with angular limestone waterworn pebbles, 
passing down into pure bone-earth, with hseynas, rhino- 
ceros, 2ft. Oin. 
Diluvial clay, pebbles of clay-slate, splintered bones and 
stalactites, 2ft. 
Coarse and fine sand, loam, and clay, no bones or shells, 
3ft. Oin. 
Figure 1. Cefn Cave [Trimmer.] 
a. Level of Cave entrance. 
b. Mud, with rounded pebbles of grauwacbe, limestone or wood, 
covered with stalagmite. 
c. Mud, bones, and angular fragments of limestoae. 
d. Sand, silt, with fragments of marine shells. 
e. Fissure. 
f. Northern Drift. 
g. Cave cleared of mud. 
h. River Elwy 100 feet below cave. 
i. Limestone rock. 
Mr. Joshua Trimmer" in 1838 correctly described the position of 
the Cefn Caves, as being in a locality in which the local Cambrian Drift 
met with that derived from the north. He states the beds nearly 
filled the cavern to the roof, which communicated with the surface 
by fissures, and describes the Northern Drift as occurring both on the 
surface and in the fissures. He describes the sedimentary deposits 
* Trimmer. Cefn Bone Cave. Brit. Assoc. Report for 1838-1839. Also 
Practical Geology and Mineralogy, London John W, Parker, 1841, p. 400 etc. 
