( 655 ) 



This is the first time that nientioii is made of such an erratic- 

 hUK'k from the Dutch diluvium. Many of tlic kind, witli remains 

 of Ellipsocephahis Polylomus or of oJIkm- fossils, occurring- in Oeland 

 in the layer with Paradoxides Oelandicus, have already been found 

 in the German diluvium. The first of them was menlioned by Dames ^) 

 and comes from Rixdorf ncai* Berlin. A few years after, Remele ') 

 described two such erralic-l)locks from the neighbourhood of Ebers- 

 walde. Later on, Roemkk '') made inenlion of Iwo erratic-blocks of 

 the same age. One of I hem comes from Rostock and bears much 

 resemblance, according (o the description, to the Grouiugen jnece. 

 This cannot with so much certainty be said of the second block, 

 which was found at IJromberg and does not seem to be greenish. 

 In Sleswick-Holstein, too, corresponding erratic-blocks seem to have 

 been found, as Stolt.ki.i ') writes about ,/grüuliche Kalkgeschiebe der 

 Oclandicus-Zone". 



This erratic-block also conlirms my supposition formerly '') men- 

 tioned, that in the Hondsrug occur more sedimenlary erratic-blocks 

 with a West-Baltic character, than was formcrlj' generally supposed. 



II. For some time already I have had in my collection several 

 pieces of an erratic-block consisting ofjimestone that has been tinled 

 dark-grey, even almost black, by bitumen. It was found in the loam- 

 pit near Hemelum. Its calcium-carbonate having for the greater part 

 crystallized, this limestone approaches antraconite. Some nests of little 

 pyrite-crystals and a small phosphorite-nodule are found in the stone. 



For a long lime the only fossil that \vas exposed to sight was 

 (with the exception of a few unimportant remains, probably of a 

 Paradoxides) what I supposed to be the internal cast of the inside of 

 a piece of Trilobite-shell. Its largest dimension amounts to 9 milli- 

 metres. This internal cast is almost oval, and strongly vaulted. The 

 top-part finishes in a bow. On the convex side of this bow it is 

 steeper than on the concave one. In front, on the least steep part, 

 is a frame in relief, soon turning round the most elevated point and 

 then continuing on (he sleepest part, where it becomes tinier and 

 tinier. Towards either side springs from this frame a net-work of 



1) Dames, Zeitschr. d. deulsch. geol. Gesellschaft. Bd. 31. 1S7*>. pag. 795. 



2) Remelé, Zeitschr. d. deutsch. geol. Gesellschaft. Bd. 33, 1881. pag. 181, 700. 

 5) Roemer, Lelliaea erratica, pag. 2G. 



^) Stolley, Die Claiiibi'isciien und Siliuischen Geschiebe Sclilcswig-Holslcins urid 

 der benachbarten Gehiete, 1895. Bd. I, Heft 1, pag. 40. 



*) BoNNEMA. "Cambiiaii <'ii'alic-blocs at Hemei.um in tlio South-west of Frisia." 

 These Pioc. 1902, p. iU. 



