WILMORE : THE STRUCTURE OF SOME CRAVEN LIMESTO^'ES. 43 
the quarry on the highway is reached, where it is about 10°. 
The strata are continued on the east side of the highway and 
are exposed in three or four small scars and an old quarry, 
then they are lost beneath drift on lower ground. The rocks 
in the roadside quarry are very massive, dark-blue, weU-bedded 
limestones, containing Productus giganteus, P. semireticularis, 
crinoidal stuff, and Syringopora sp. 
The total thickness exposed is about 800 feet, and the 
shales with limestones are at the base. 
Further X. there are exposures on the S.W. side of Swinden 
Moor, where the strata dip E., X.E., and almost due X. 
At Swinden Moor Head there are massive limestones of 
the grey type, rather flaggy, and with numerous shale partings. 
Here I obtained stems, plates, and spines of Echinodermata, 
Zaphrentis sp., Fenestella sp., Chonetes papilionacea, Productus 
p'ustulosus, Pr. punctatus. 
At the Xappa end of Swinden Moor there are further ex- 
posures. Massive Hmestones dip X.X.W. at an angle of 30°. 
The general sequence here is — 
Dark, hard massive Hmestones. 
Soft black shales, with thin crinoidal limestones. 
Massive, dark-grey limestones. 
Crinoidal fragments stand out on the weathered surfaces 
and great numbers of the ubiquitous stems, plates, and spines 
occur in the shales. I obtained one broken " head " of Platy- 
crimis. Syringopora geniculata a,nd S. ramulosa are common. 
I also obtained Orthis Michelini, Athyris sp., Productus scah- 
riculus, ? Macrocheilus sp., Euomphnlus sp. 
Fenestella is very common in the soft shales. 
There are thus two chief types of limestone in the district, 
one the irregularly bedded masses of Obvious Organic ^Material 
and showing beach accumulations free from much ordinarj^ 
sedimentary matters. The other is mainly made up of Amorphous 
Detrital matter derived from the mechanical wear and tear of the 
hard parts of organisms, aided by partial solution probably. In 
some cases the amorphous material has again taken on the 
