( 572 ) 



MoBERG says that these cri-aties were found by Dr. Holst on 

 Boriiholiii, too. Neither in German nor in Dutch literature ha\'e I 

 been able to tind anything concerning suchlike erratic-blocks. It is 

 almost doubliess, however, that they are mentioned by Gottsche ^) 

 as "Cambrisclie Grauwackeschiefer". Only those erratic-blocks whicli, 

 according to him, resemble the Swedish "Gravackeskifer", must be 

 taken into consideration then. The description of the latter entirely 

 corresponds with that of type a by jMobekg. The small, round, 

 horny-lustrous Brachiopodes-valves with a diameter of 2 millimetres, 

 mentioned by Gottsche, which may come from Discinella Holsti 

 MoBERG, also canse ns to conclude that we have the same kind of 

 stone here. Gottsche does not infoi-m us of Hyolithus-remains occurring 

 in suchlike erratic-blocks. No erratics containing them had perhai)S 

 been found at the time. It follows from what he orally comnuuii- 

 cated to me, that now they have most ju-obably been found. 



The same author says that according to Linnarsson a kind of 

 stone entirely corresponding with the one described by him, has 

 been met with by llrMMEi, lu^ar Tereskov (wich Hummel calls Torekov), 

 on the coast of N. W. -Schonen, as tirui rocic. Judging IVoui the 

 description Hummel') gives of it, it much resembles, petrographically, 

 type a of the Discinella Uolsti-sandstone. Hummel does not say, 

 however, that fossils are found in it. Perhaps we have here 

 the same case as witii the Glaucouilic sandstone from the neigli- 

 bourliood of Simrishamn, (tf which Holst') writes that a corre- 

 sponding kind frequently occurs in the "sandstone-region" of the 

 Kalmarsund. Here, too, the resemblance seems to be petrographic 

 at best, for jMoberg, in his essay, speaks about this sandstone no 

 more than about that of Torekov. 



Most probably the thin-layered, greenish stone whicli resend)les 

 the "Grauwacken-Schiefer" of the Olenellus Kjerulti-region, and 

 which petrographically keeps the medium between the Olenellus- 

 stone of Hardeberga in vSchonen and the equally old "grön skifFer" 

 of Bornholm, with stone-kernels of a Brachiopode probably belonging 

 to Acrothele, and with Hyolithus-remains bearing the greatest resem- 

 blance to Hyolithus Lenticularis Holm, as Stolley ^) writes, — is 

 also Discinella Holsti-sandstone. 



1) Gottsche. DieSedimentar-Geschiebeder ProvinzSchleswig-Holstein. 1883. p. 8, 



2) Hummel. Beskrifning till kartbladet ,B:islad". (No. 60j. Sveriges geologiska 

 Undersökning. 1877. p. 10. 



^) Holst. Beskrifning till karlbladcl Simiishaiini. p. 15. 



*; Stolley. Die cambrischen und silurischen Gescliiebe Scbleswig-Holsteins. Arcliiv 

 fur Anthropologic und Geologie Scbleswig-Holsteins und der benachbarten Gebiete. 

 1895. Bd. 1. Heft. 1. p. 130. 



