WILMORE : THORNTON, MARTON AND BROUGHTON-IN-CRAVEN. 363 
view that the beds of Marton " are certainly a long way down 
in the series." I do not know of any possible evidence except 
that of the fossils, and these do not warrant such a conclusion. 
The beds seem to me to be pretty much on the same horizon 
as those of the Thornton anticline. 
There are several fairly good exposures, and fossils may 
be obtained in most of them, though not in any great profusion, 
except in those of Marton School and Clint's Delf. In all ot 
them the dip is north of west, varying from about 15^ to 50^, 
but generally not more than 20°. A notable feature of the lithology 
is the large amount of chert that is found in the beds of East 
Marton and in the small quarries slightly further east — Xos. 
(19) and (20) on map. The chert occurs in thin layers of from 
one inch to about four inches in thickness, and also in somewhat 
irregular lumps. It is sometimes seen to contain crinoid frag- 
ments. 
The highest beds which can be studied seem to be those 
of Marton School, East Marton Old Quarrs^ and Clint's Delf — 
Nos. (17), (18), (22) on map. Here there is always the great 
abundance of crinoidal limestone that characterises the upper 
beds of the Carboniferous Limestone in the Thornton anticline, 
and that is prevalent in the higher beds of the same limestone 
in the Clitheroe-DowTiham district. The stems and plates of 
Echinoderms are beautifully preserved in Clint's Delf. The 
calcareous mud in which they occur crumbles very readily and 
these fossils may be picked up by hundreds. 
Here again, as in the Thornton anticline, there are shale 
bands, or " shale-partings," as they are called locally, separating 
the massive dark limestones. It is from these shale bands that 
the most perfect fossils are usually obtained. The massive 
limestones, which are bluish-black on fracture, weather 
to yellowish-grey, and as the fine matrix is slowly eroded 
away, the megascopic fossils — corals, crinoids, shells — begin 
to stand out from the weathered rock surfaces. In this 
way the most unpromising soHd rock, when it has been 
left exposed in the old quarries for years, often reveals very 
good fossils. 
