340 Dr. A. P. Young — Structure of the Tarntal Mass. 



5. Green quartzite schists, with red haematite schists, with well- 

 developed plane parallel jointing, frequently with well- 

 marked handing transverse to the foliation (see PI. XVI, 

 Fig. 3) 73 metres. 



4. Band of dolomite freely penetrated by quartz veins, with 

 dolomite breccia, here called ' Tarntal dolomite '. This 

 rock, broken rather than sheared, has been kneaded into 

 the schists by the folding movements . . 75 metres. 



Zone of maximum contortion. 



3. Calcareous schists showing conspicuous mechanical foliation. 



95 metres. 

 2. Limestones distinctly bedded with dip to north-east, otherwise 



little disturbed ...... 40 metres. 



1. Massive dolomite, unstratified, showing brecciation in places 



without signs of shearing . , . .330 metres. 



The continuation of the series is best shown in the Upper Tarntal, 

 a little to the south of the above. On the floor of the valley, at 

 about 2600 metres, the flaggy limestones, more crumpled than in 

 the Nederer section, are seen to dip to the south under the highly 

 disturbed dolomite (the equivalent of No. 4 in the above section). 

 The slope of the Reckner just above is occupied by hardened schists 

 of the same group as those seen at the Nederer summit. On these 

 rests the great mass of the Reckner Sei'pentine, some 260 metres 

 in depth. 



The intrusive character of the serpentine is well seen at several 

 contacts with the schist, but more especially in a row of occurrences 

 crossing the valley of the Upper Tarntal in a northerly direction. 

 On the steep scarp over the Lizumtal on the east side of this valley 

 is a small occurrence of serpentine completely embedded in the 

 schists. The junction of schist and serpentine is very irregular. 

 The injection at the contacts of small veins and lenses of basic magma 

 into the schists has been described in an earlier paper.^ The penetration 

 of the serpentine into the schist has taken place for the most part 

 along the foliation planes, which are here crossed by the bedding 

 planes, showing that the foliation was already developed at the time- 

 of the intrusion. 



As far back as 1859 ^ Adolf Pichler announced the discovery of 

 Eelemnites and other fossils in place, and affirmed the Liassic age of 

 the higher beds in this locality. In a personal communication addressed 

 at a much later date to Professor Rothpletz, Pichler mentions a 

 specimen of Atnmonites radians which he collected here and sent to 

 Vienna : this fossil cannot, it seems, be traced. Since that time the- 

 only organic remains found have been certain Brachiopods, Lamelli- 

 hranchs, and corals pronounced to be of Rha3tic age.^ 



^ A. P. Young, " Stratigraphy and Structure of the Tarnthal Mass " : Q.J.G.S.,^ 

 November, 1908, vol. Ixiv, pp. 596-603. 



^ " Beitrage zur Geognosie Tirols " : Zeitschrift des Ferdtnandeum, 1859. 



^ A. Rothpletz, Querschnitt durch die Ostalpen, 1894, p. 75. The fossils named 

 are: Tereiratula gregaria, Modiola minuta, Gervillia prcecursor, Corhiila alpina,. 

 Fecten sp., Thecosmilia ct. fenestrata, Reuss, and cf. Convexastrceci Azzarolte, Stopp. 



