532 Karl A. Grönwall. 



derived from molluscaii shells (gastropoda and lamellibranchiata); all 

 the fragments of bryozoa, brachiopod spines and loraminifera, which 

 were so common in the other limestones, are, on the other hand, 

 entirely absent. As was stated above, this rock alternates with an 

 irregularly stratified clayey sandstone, its nature recalling in a high 

 degree deposits of impure clay ironstone (spherosiderite) in terrestrial 

 strata. The coal fragments it contains also support such an inter- 

 pretation, as does the absence of smaller organic fragments, which 

 are so prominent in the other limestones in the series, even if, mega- 

 scopically, these appear perfectly dense. 



Somewhat further eastwards, east of the mouth of the river, 

 some rock specimens were also obtained : 



"12 (bildet mit 13 und 14 ein Profil) etwas östlich von der Elf- 

 mundung, ca. 10 m. über d. Meere. Dunkler Kalk, etwas grünlich 

 getönt, mit kleinen weissen Fossilien. Untere Grenze verdeckt, ca. 

 2 m. Dicke freilegend. Oben übergehend in 



13. Dem vorigen ähnlich, mehr schieferig. Anscheinend ohne 

 Foss. Nur etwa ^/2 m. dick. 



14. Rötlicher Sandstein (?) mit zahlreichen in Nestern zusam- 

 mensitzenden Fossilien, von ca. 5 m. über dem Meere ab aufwärts, 

 ca. 30 m. freiliegend". 



This series consists of three specimens ; 12 of a limestone {N:o 

 14-6} almost black and somewhat bituminous; it is unevenly bedded 

 and appears to possess partings of more shaly or marly character. 

 13 is a gray clay shale {N.0 162), fairly w^ell stratified and slightly 

 calcareous. 14 is a yellow-red limestone {N:o 136) Avith alternat- 

 ing deposits of clay, recalling the Ambigua limestone of Beeren 

 Eiland, and agreeing perfectly with the red limestone which, in 

 Koch's profile, w^as found, partly in situ at 200 m. (N:o 155) and 

 partly as boulders at a somewhat lower level {N:os H3, 144^ and 194). 



The dark limestone (N:o 146) contains of megascopically visible 

 fossils nothing but crinoid stem-joints and a few ostracoda. Under 

 the microscope it proves to contain numerous fragments of organ- 

 isms in addition to crinoid-parts, foraminifera, which are specially 

 numerous, both a Fusulina (fairly numerously represented) and, 

 more rarely. Tetrataxis and Bigenerina and rotaliform species. There 

 are, in addition some few young forms of gastropods and fragments 

 of brachiopod shells. These fossil-fragments which are, partly, pre- 

 served in crystalline calcite or enclose this substance, seem to lie 

 inbedded in an almost dense matrix. 



The red limestone (ISI:o 136) has, megascopically, a uniform, very 

 finely crystalline appearance, which is broken only by some few 

 crinoid stem-joints. Under the microscope this rock proves to consist 



