— 86 — 



Gneisses, Avelches ösllicli gleich hinter GiiLlanneu aiislehl. Bonney fälirl 

 fori: «We Iraced llie last named (crushed normal giieiss) down lo 

 Ihc neighbourliood of -a paUiway which leads into Ihal village by a 

 bridge over llie Aar. Here il consisls of allernating bands of qiiarUo- 

 feldspathic and of more micacious rock — Ihe former rather more Ihan 

 a qiiarler of an inch in Ihickness, the latter about one inch — a com- 

 mon type in the gneiss of the valley below Gullannen, Ihough here 

 raucli conlorted. Biit at a distance of a few yards, close by the path 

 we again fouiid the Carboniferous gneiss. in which are spols of a 

 white mineral rather smaller than a pea, suggestive o 

 a f r a g m e n t a 1 s t r u et u r e etc. » 



Bonney gibt, auf seine Begehung der Umgebungen Gutlannens 

 gestützt, auf pag. 392 ein Profil SSE— NNW durch das Jiashthal 

 in dessen Längsrichtung von Innertkirchen bis zur Schwarzbrunnen- 

 brücke. Von Nord nach Süd untei'sctieidet er «Gneiss-, in welchem der 

 Pfaffenkopf Kalkkcil eingebettet ist, dann «Younger Gneiss- bis 

 etwas ausserhalb Gutlannen, weiter eine Zone bezeichnet mit «Carboni- 

 ferous» etc. (schwarz gestrichelt), worauf gegen Süden der «Granit- 

 gneiss» folgt, bezeichnet mit Gr, in welchem, in der IJölie an das Car- 

 boniferous anstossend, in der Tiefe von demselben getrennt (durch Gr.), 

 eine «Zone of Hornblende schists- etc. eingezeichnet ist. Bonney dis- 

 cutirt Baltzers Untersuchung des Stammes in der 24'™ Lieferung der «Bei- 

 träge ». Er hebt zwei Punkte hervoi': «One is an Omission. The slems in 

 the block from Gutlannen are fairly well prescrved, inner and ouler 

 casls boing retained, with some indications of an intervening 

 ra a t e r i a 1 (v. Referent gesperrt) much as may be oflen seen in a Sand- 

 stone from a Carboniferous system. But if the molecular changes 

 among the consliluents have been sufficient lo Iransform a shale or 

 a grit into a gneiss, is it not stränge that anything more than a 

 mere trace of the plant should be preserved ? 1 do not say that the 

 difflcully is insuperable, but il oxists, and ought, il appears lo me, lo 

 have been carefully discussed. Yel we do not find a word on the 

 subjccl. Tlie occurrence of a fairly well-preserved fossil in a rock 

 which has passed into a crystalline condilion seems lo be regarded 

 as a lliing perfectly normal and natural. Here is the second point : 

 «We might haveexpected ample evidence thal the rock of the Gullannen 

 boulder had been carefully compared whils numerous specimens 

 of gneisses and crystalline schisls from olhor parts of the Alps, al leasl, 

 in Order lo show that it agreed completely willi Iheui in Ihe carac- 



