366 Professor Sedgwick and Mr. M urchison on the 



These beds of hippurite-limestone are well exposed near the village called 

 Adrigang, and are covered by a greyj hard grit probably of the green-sand 

 series. 



The strata of the ascending section are best exposed along the course of a 

 small rivulet which descends to Griinbach, a little to the west of Adrigang. 

 On that line we have the following groups of strata ; and we may observe, that 

 as they advance into the valley they gradually become less inclined, those 

 near the side of the Wand being quite vertical. 



a. Yellowish sandstone with green grains, alternating with bands of shale : the whole thick- 

 ness of this group is not exposed. 



b. Coal, two to three feet thick, worked on the strike of the beds by horizontal galleries 

 driven from the side of the rivulet. 



c. Sandy shale and finely laminated marl, at least 300 feet thick, and of various colours, 

 yellowish, blue, grey, and green. 



d. Coal. An upper bed of about the same thickness as the preceding, and worked in the 

 same manner. The carbonaceous and hard calcareous grits forming the walls of this seam are 

 full of small, compressed shells, among which a bivalve, probably a Cyclas, is the most charac. 

 teristic ; and a small Turbo appears to be of a species found at Gosau. The best parts of the 

 coal are of good quality, but the refuse is so pyritous that it ignites spontaneously by exposure, 

 to the atmosphere. 



e. A series of marl and shale beds, ill exposed, being partly obscured by alluvial covering, and 

 partly carried away by denudation. 



/. Hard nummulitc-grits rising into a ridge. In these beds we could detect no other fossils ; 

 and the Nummulites themselves are so cemented in the solid rock as to make it almost hopeless 

 to look for specific characters, 



g. An interval in which a series of soft beds have been nearly washed away. They appear 

 to have been composed of blue marls, and to have contained many fossils (such as Fungias, &c.), 

 which are found scattered )ipon the surface. 



h. Harder and more arenaceous beds near the village of Griinbach, with shells of the genera 

 Inoceramus, Pectunculus, Rostellaria, &c. 



The rocks south of the village consist of micaceous and calcareous sand- 

 stone, and are specially distinguished by serpuline bodies very similar to those 

 found in the nummulite-grits which overlie the cretaceous group of the 

 Lntersberg section, and underlie the blue marls with Gosau shells*. On 

 this account we are disposed to consider these grits as a part of a group 

 older than the marls in the centre of the valley of Griinbach. 



To make the preceding section complete, it ought to be prolonged across 

 the valley and joined to the outer or south-eastern ridge of Alpine limestone. 

 We have, however, abstained from this, as we wish none of our illustrative 



* Plate XXXVI. fig. 9. 



