Correspondence—C. H. Hitchcock—2J. Smith. 239 
Both authors will discuss the phenomenon, together with certain 
kindred ones, in works now in the press, and as these will be published 
outside this country the object of this letter is to mvite the attention 
of British geologists to this very curious and most original suggestion. 
EpwarbD GREENLY. 
P.S.—Perhaps I might add that the pipes are very near to a zone 
of powerful faulting, which, though displacing the Carboniferous 
rocks more than 1,000 feet, was almost certainly a line of movement 
in much older times. Movement along it, therefore, was very likely 
going on at intervals during the Carboniferous period itself. 
FOSSIL FOOTPRINTS IN THE SECONDARY ROCKS. 
Srr,—I am returning to the study of the Triassic footmarks of the 
Connecticut, and would be glad to correspond with the Officers of 
Museums with reference to slabs of Ichnites found especially in Great 
Britain. My experience leads me to believe that the tracks of animals 
on stone are more abundant than is commonly supposed, and that there 
is much to be learned from their study. Although rather bulky, 
a place can be found for them in the Exhibition Rooms, and perhaps 
exchanges can be negotiated. 
C. H. Hircucocr, 
Curator of the Butterfield Museum, Dartmouth College, 
Hanover, New Hampshire, U.S.A. 
March 7th, 1907. 
CONODONTS IN COAL-MEASURE STRATA. 
Sir,—Not long ago I sent you a notice of the occurrence of marine 
fossils in the Upper Coal-measures (Scotland). From the same bed 
I have now to record the finding of a few Conodonts, the determinable 
species being Centrodus lineatus, Pander, and Polygnathus ( Gnathodus) 
Mosquensis, Pan. Both these forms were found by Pander, of Russia, 
in the Mountain Limestone of Moscow, and they occur in both the 
Upper and Lower Carboniferous Series of Scotland. C. dineatus has 
been got in the Devonian rocks of Canada and Carboniferous of Ohio. 
The list of fossils from this bed is as follows, all the forms being 
dwarfed except the Conodonts, which could not be made much 
smaller :— 
Productus semireticulatus. Dentaliwn? 
Chonetes Hardrensis. Nautilus ? 
C. Buchiana. Polyzoan, badly preserved. 
Athyris ambigua. Cladodus. 
Discina nitida. Coprolites and fish-remains. 
Lingula mytiloides. Plants and vascular tissue. 
Pecten, ribbed. Centrodus lineatus. 
Posidoniella vetusta. Polygnathus Mosquensis. 
Murchisonia striatula. 
The position of this marine bed is pretty well up in the Coal-measure 
Series, probably a short distance above the Craigmark Ironstone, 
Craigmark Glen, Dalmellington. J. SMrrH. 
Dyxes, Datry, 
AYRSHIRE. 
