28 GEOLOGICAL MEMOIRS. 



varian frontier. The researches of MM. Emmrich and SchafhautI, 

 and a collection from this country kindly communicated to me by 

 M. Schlagintweit*, prove that these strata exist around Woessen and 

 Ilochfellen (north and north-eastof Koessen), also at the Wendelstein, 

 near the mineral bath of Kreut, near the Gruberalpe at the Salzberg 

 (von Buch), at the foot of the Ilohe Kramer and of the Zugspitz, 

 at the Wetterstein, and in the Leuctasch valley. MM. Emmrich 

 and SchafhautI have published several notices of these localities. 



From these points a considerable number of localities extend 

 through Tirol, Vorarlberg, and the canton of Grison; in some of them 

 MM. Escher von der Linth and P. Merian have recently found 

 the same fossils as those which are regarded as the most characteristic 

 of the Koessen strata around Vienna. These well-ascertained localities 

 are connected by others, where isolated fossils have been found, but 

 which I do not mention here, as the above enumeration is quite 

 sufficient to prove the continuity of the whole line. The rich 

 localities in the Vorarlberg and in the valley of the Lech may 

 undoubtedly find their proper place among this series ; so that the 

 Koessen strata may be considered as a formation extending from 

 west to east between the Brandner Ferner and Gumpoltskirchen near 

 Vienna. 



We know far less about the southern declivity of the Alps ; but 

 the Dachstein limestone, which also belongs to the Koessen group 

 and plays so important a part in the central chain, being highly 

 developed there, we may expect that the continued researches of the 

 Imperial Geological Institute will there discover still more distinct 

 traces of the Koessen strata. 



The Museum at Innsbruck contains fossils, collected between the 

 Rauchkofel and Lienz, which are considered by M. von Hauer to 

 belong to the Koessen series ; similar fossils are also said to have been 

 found by MM. Escher and Merian in the environs of the Lake of 

 Como in the Val Brembana, Val Seriana and Val Trompia, and they 

 may be supposed to exist too in the Val di Amone near Roveredo. 

 Dr. Lavissaro communicated to the Imperial Geological Institute a 

 series of silicified fossils, imbedded in a dark grey siliceous limestone ; 

 among these were Spirifer rostratus, Sp.Muensteri, and an undeter- 

 minable Rhynchonella ; Spirifer rostratiis is found at Tremona in 

 a black marly limestone (Studer, Geolog. d. Schweitz, vol. i. p. 481). 

 The Lyceum of Bergamo also has communicated a fossil not distin- 

 guishable from Gervillia injiata^ from the black limestone of Monte 

 Misma. 



II. Starhemherg Strata and Dachstein Limestone. 



The Starhemherg Strata consist of yellowish or reddish limestone, 

 intercalated as thin layers in the Dachstein limestone. Their fauna 

 is quite identical with that of the Koessen Strata ; only two or three 

 very rare species are known which have not yet been found also 

 in the latter formation. The Brachiopods appear in very great 



* See Quart. Journ. Geol. Soc. vol. x. p. 348. 



