RAYMOND: CORRELATION OF THE ORDOVICIAN STRATa. 215 



Limbatakalk — The greater part of the "Lower Red" probably 

 belongs to this zone. Megalaspis limbata, Nileus armadillo, and 

 Si/mphi/surus ])alpehrosus are common here, and a number of other 

 species were collected. 



Asaphuskalk — I did not find fossils other than Sphaeronis pomum 

 and Megalaspis hews very common in this zone. Several other species 

 have been reported, among them Phacops sclerops, Cyrtometopus 

 clarifrons, Asaphus raniceps 7naximus, etc. The numerous cephalo- 

 pods assigned to this zone in lists seemed to be derived from the lower 

 part of the "Upper Red" and possibly to indicate the Gigas rather 

 than the Asaphuskalk. Among these are Vaginoceras wahlenbergi 

 (Foord), Bathmoceras linnarssoni (Aug.), and Estonioceras proteu-s 

 Holm. Megalaspis gigas itself has not been found, but the cephalopods 

 mentioned indicate, I believe, its zone. 



Platyuruskalk — Asaphus platyurus and Orthoceras tortum are 

 reported from the upper part of the "Upper Red." 



Chironkalk — The "Upper Gray" evidently represents the zones 

 of both Illacmis chiron and Ancistroceras. Illaemis chiron Holm, 

 Ogygiocaris dilatafa sarsi Angelin, Ancistroceras undulatum Boll, and 

 Discoceras teres Eichwald have been reported. 



The next formation, the Chasmopskalk, is not exposed on the side 

 of Kinnekulle which I visited, but it is reported as being a dark green 

 graptolite-bearing shale with lenses and layers of impure limestone. 

 The graptolites are not listed, but the limestone is said to contain 

 Chasmops sp., Remopleurides sexlineatus, Ptychopygcf glabrata, Am- 

 pyx rostratus, Echinosphaerites aurantium, etc. The thickness is ten 

 meters. 



The Trinucleus shales, which are not well exposed, are said to be 

 thirty-two meters thick and consist of two shales separated by a thin 

 limestone. The lower twelve meters consist of black and greenish 

 shales separated by two meters of limestone from eighteen meters of 

 the red shale above. Among the forms listed from the upper shales 

 are Remopleurides radians, Cybele verrucosa, Trinucleus icahlenbergi, 

 and Dionide euglypha. 



The Brachiopodenschiefer are said to be represented by twenty-six 

 meters of calcareous shale below, followed by two and four tenths 

 meters of impure sandy limestone. Fossils do not appear to be com- 

 mon, Dalmanites mucronatus , D. pulchellus, and Homalonotus platy- 

 notus being the chief ones reported. 



I visited Alleberg, but found it impossible to get good fossils without 

 spending more time than was at my disposal. 



