226 Scientific Intelligence. 
striking character of this unconformable junction is well brought 
out upon the map, where two large cakes of the overlying rocks 
are seen to sweep over both anticlinal and synclinal folds of 
the lower formations. ‘These cakes consist of brecciated dolomite 
or limestone, chlorite-slate, dioryte and serpentine, having a total 
thickness of perhaps 1,500 feet. Their exact geological horizon 
ems not yet quite satisfactorily fixed, but they are placed pro- 
nm eS 
phosed strata.— Notice of the Report on the Geological Survey of 
Newfoundland for 1874, in Nature of July 20. : 
12. Oldhamia in Wisconsin.—In a letter to one of the editors 
of this Journal from Mr. J. W. Porter, dated Eau Claire, Wiscon- 
sin, June 12th, the writer states that he has found the Oldham 
radiata abundantly and very perfect in the vicinity of Eau Claire. 
In the bluff around this place there is a large exposure of Potsdam 
sandstone, quite fossiliferous, with numerous Trilobite impressions 
of several species, Pteropods and Lingule, besides Fucoida! ir 
pressions and wave marks. With the Oldhamia radiata occurs 
Scolithus linearis, and neither of them seems to extend as high rs 
to the beginning of the other forms, or to the bottom of the san 
Stone exposures, 
13. Leef-building corals in the Tasmanian ‘ oe 
P. Martin Duncan has described the new reef-building speci 
? . 
of the present southern limit of the coral-reef seas in that part 
the ocean. ; 
14, C. e editors, 
dated Montreal, July 24, 1876.)—In a recent visit to the Sou 
of Specimens were found in the material filling an ere¢ 
im group XXVI of my section of the South Joggins, has also 
group in which Marsh’s Zosawrus was found, and which mene 
afforded reptilian footprints. The bed is 222 feet above 08 first 
