( 700 ) 
much more with our boulders. It is however but a badly preserved, 
weathered piece, so that it is not very important. 
Taking all this into consideration the origin of our boulders is 
probably to be found between Oesel and Gothland, where there is 
every reason to assume that along the line Far6—Taggamois lime- 
stones of the age of the I-zone have been developed. 
More or less closely allied to this Baltica-limestone are different 
boulders which for their fossil contents may best be referred to the 
Lower Oesel zone: 
a. Yellowish-gray limestones with: 
Proetus concinnus Datm., var. Osiliensis Scum. 26, T. IV, f. 1—9. 
Calymmene tuberculata BRÜNN. 26, LT 
Cyphaspis elegantula Lov. sp. 7, TEM 
Encrinurus punctatus W Ans. 
Strophomena rhomboidalis Wiuck. sp. 
Orthis sp. 
They closely resemble some pieces of Baltica-limestone and most 
likely neither differ very much from the latter in age. Without 
tracing their occurrence in particulars here the following list shows 
sufficiently why they are mentioned here: 
Gotland (16) Oesel (26) 
P. concinnus Daum., (var. Osiliensis ScHM.) (c—e) T 
C. tuberculala Brinn. ej I 
C. elegantula Lov. sp. c if 
Eight pieces of this limestone are from the following places: 
“Boteringesingel”’, Groningen 2 
“Noorderbinnensingel”’, __,, 2 
“Nieuwe Veelading”, Pe 1 
EN il 
“Hilghestede’’, Helpman 1 
al 
” 
Again the tract between Gothland and Oesel must be looked upon 
as the place of origin by reason of perfectly similar considerations 
as mentioned in dealing with the Baltica-limestone. 
b. Perhaps two limestone-rocks also belong to this with 
Bumastes barriensis Murcu. 
found in the “Nieuwe Veelading” and the “Schietbaan” in Groningen, 
