TRANSLATIONS AND NOTICES. 



OF 



GEOLOGICAL MEMOIRS. 



On the Extension of the "Calcaire grossier de Mons" into the 

 YALLEr of the Haine. By Messrs. E.-L. Cornet and A. 

 Briart. 



[Xotic9 sur i'extension du Calcaire grossier de Mons dans la rallee de la 

 Haine ; par MM. F.-L. Cornet et A. Briart. Ball, de I'Acad. rorale de Bel- 

 gique, 2iiie serie, 1. xzii.] 



Since the publication of their former paper on the '•' calcaire grossier 

 de Mons" the authors have continued their researches, and the in- 

 terest which that communication evoked has induced them, in this 

 notice, to lay before the Academy the results of some further ex- 

 plorations. In 1865 about 150 species had been obtained from the 

 rubbish of the Goffint Trell ; now more than 300 Gasteropods and 

 Lamellibranchs, 10 Bryozoa, 4 Echinoderms, 7 Corals, and about 25 

 Entomostraca and Foraminifera have been collected by the authors, 

 and are waiting for detailed descriptions. 



About 400 yards to the east of the Goffint well, along the road 

 from Mons to Obourg, a well was sunk in 1 8G5 by M. D. Coppee. 

 After passing though a thin bed of Quaternary grey sand, which 

 here, as everywhere in the environs, overlies the Tertiary and Cre- 

 taceous formations, the lower Landenien green sands were reached. 

 At a depth of 11^ feet these sands were found to lie in a depression 

 of the " calcaire grossier," the junction being marked by iiTCg-u- 

 lar masses of flint and limonite. These depressions at the base of 

 the Landenien are very common throughout the province and the 

 neighbouiing cantons, from which the authors infer that the " Cal- 

 caire grossier de Mons*' was deposited prior to the great period of 

 denudation which has been thought to have occurred between the 

 end of the Cretaceous period and the deposition of the Tertiary strata. 

 The Coppee well has been sunk 78 feet in the '' calcaire grossier.'' 

 The mineralogical characters of the specimens obtained from it are 

 very similar to those of the rocks from the Goffint sinkings, and the 

 fossils, which are not abundant, are all, except the Bryozoa and 

 Foraminifera, in the state of casts. 



In the previous paper, a section was noticed near the cemetery of 

 Mons, the fossils of which were in the collection of 31 . ToiUiez. 

 The "calcaire grossier," which was met with 50 feet from the 

 surface, and extended to a depth of 225 feet, contained fossils 

 referred to the following genera : — Melanopsls, Cerithiwu, Eulirna, 

 Bithi/nia, Bissoa, Nematu.ra'?. Turbo, Ddphinida, Turrittlla, Area, 

 Cardita, and PectuncuJiis. Below the " calcaire grossier," 72 feet of 

 hard limestone, containing numerous blocks of flints, were traversed, 



VOL. XXIII. PART II. c 



