VOL. XIV. (2) RHAETIC ROCKS 143 
into it on the edges. There appear to be two distinct 
deposits of selenite. The first was deposited on fibrous 
calcite and invaded it in small veins. This was altered to 
earthy gypsum by percolating water, and on this a second 
layer of selenite was laid down. Thus diagrammatically :— 
FATT 
vai Cy i 
Selenite 
Earthy gypsum 
Tl 
g, 
| 
f 
Fibrous Calcite 
with veins of 
Selenite 
Earthy gypsum 
Seles Seetatent set aaa 
FIG. 2.—MINERAL VEIN 
Bed 5a contains a very fossiliferous sandstone band, the 
sandstone casts of the lamellibranchs being well defined 
when first laid bare. 
4.—COOMB HILL SECTION. 
(TABLE II.) 
The Coomb! Hill section is situated 234 miles E.N.E. 
of Wainlode, and has been frequently described and 
examined. Now, however, as is so often the case in 
sections exposed in road-cuttings, vegetation has obscured 
the Upper Rheetic strata, but the lower division can be 
easily examined by excavating the bank. 
a—Published Observations in Chronological Order. 
Though Murchison’ noticed the section, the Bone-bed 
did not attract his attention, the excavation having been 
then made for many years. In 1841, however, the road to 
the canal was lowered, and Mr Dudfield, of Tewkesbury, 
collected a large quantity of ichthyic and saurian remains.? 
x Also spelt Combe, locally Coombe. In the lane leading to Staplings, near the 
Leigh, black shales and two brown micaceous sandstone bands are exposed, the lower 
being the equivalent of the Bone-bed. 
2 Murchison’s “ Geology of Cheltenham,” Ed. i. (1834), p- 24- 
3 Ibid. Ed. 2 (1845), P--53- 
