1913] TRANSITIONAL QUATERNARY STRATA 



Abra longicallis Sc. Of this species only a single small 

 specimen of length 7 mm. was found, and, even this specimen 

 proved to be of a rather ovate shape. 



IV. As well in the npper clay-pit of the lower brick-work 

 of Bentse as in the lower clay-pit of the upper brick-work of 

 Bentse, in the summer of 1900, I succeeded in tracing a layer to 

 the thickness of about one meter and a half consisting of fine, 

 bluish-grey or even bluish clay directly overlying the deposit of 

 the Aker stage. This clay was very soft and tough and con- 

 tained rather numerous fossil specimens of the following 

 species: — 



Portlandia lenticula Moll. forma typica was rather nu- 

 merous but as a rule only occurred in relatively small specimens 

 of length 4 mm. of a rather ovate shape. This species often 

 appears to have formed what may be regarded as small colonies 



Area glacialis Gray. Some broken specimens were found 

 that formed an intermediate type between forma typica and 

 var. raridentata, or even var. pectunculoides. One specimen 

 was measured to be of length 13,5 mm. and height 10,0 mm. 

 giving the index 0,741. 



Axinus flexuosus Mont. forma typica. 



Abra longicallis Sc. forma typica. 



Ophiura sarsii Lutk. forma typica. 



Tbis clay-deposit I have designated as forming a rather 

 distinct one named after the locality just now in description in 

 spite of its upper limit having not been fixed as it in a quite 

 insensible manner fades into the younger deposits overlying it. 

 This clay-deposit of the Bentse intra-glacial stage is, however, 

 rather well distinguished by the morainic deposits of the Aker 

 stage and of the Romerik stage as also by the occurrence of 

 marine facies corresponding with these two glacial stages re- 

 spectively. 



V. The deposit of the Bentse intra-glacial stage as distin- 

 guished in the above description is directly covered with a de- 

 posit of bluish-grey and rather fine clay to the thickness of about 



