Upper PL 

 Turonian. 



Geology of the Harz Mountains. 227 



The Upper Chalk contains the following groups : — 



2. Seuonian. 



1 pv \ Upper Planer or Turonian. 



1. I'laner j j^q^^^qj. pianer or Cenomanian. 



1. PlIner. 



{h. ) Cuvieri beds really Senonian. Marls and marly lime- 

 stones with beds of green sand and conglomerate full 

 of sharks' teeth : Inocermnus Cuvieri, Ter. carnea, 

 Ananchytes ovatus, Micraster cor-anguinuin. 



{g. ) Scaphites beds with occasional flints. Scaphites Geinitzi, 

 Am. peraniplus, Helioceras plicatilis, Inoceramus 

 latus, cuiuiformis. 

 J (/. ) White Brongniarti beds ; grey and snow-white lime- 

 stone, compact and hard, or chalky. Inoc. Brong- 

 niarti, Rhynch. Martini, Eh. Mantellianxi, Ter. senii- 

 globosa, Micraster cor-anguinum. 



{e.) Red Brongniarti beds; flesh-red marly limestone, hard 

 and sometimes with conchoidal fracture : In. 

 Brongniarti, mytiloides, Rh. Martini, Mantelliana, 

 T. semiglohosa. 



{d. ) Poor Rhotomagensis beds, fossils rare, grey-white solid 

 limestones, hard, and wdth conchoidal fracture. 



(c.) Rhotomagensis beds, rock like b. Am. rhotomagensis, 

 Inoc. striatus, Plicatula infiata, Ter. hiplicata, Holaster 

 suhglohosus, Discoidea cylindrica. 



(b.) Varians beds. Hard grey limestones with marls, occa- 

 sional grey-white massive limestones with earthy 

 fracture. Am. varians, MantelU, Turrilites tuber- 

 culatns, Inoc. striatus, Plicatula inflata. 



{a. ) Green clayey sands and glauconitic marls. A. varians, 

 MantelU, Mayorianus, Turril. tuberculatus, Inoc. 

 striatus, Janira quinquecostata, Ostrea carinata, 

 Rhynch, latissima, Hemiaster bufo, Discoidea sub- 

 ucuVus. 



2. Senonian. 



This highest division of the Cretaceous system extends 

 uninterruptedly from Goslar to Ballenstedt in a great cake 

 which spreads out northwards over the plain at the base of 

 the mountains, and is not violently tilted up on end like 

 the underlying strata, where they abut against the older 

 rocks. V. Groddeck, to whose book I am principally in- 

 debted for the notice of the Harz rocks just given, states 

 (p. 152) that the flat-lying Senonian rocks have been found 

 in a railway cutting, through the Petersburg (to the E. of 

 Goslar), to rest unconformably on the upturned edges of the 

 Planer, as is shown on Sections 3 and 4. 



The western Senonian strata of this district are chiefly 

 marls and limestone conglomerates, but towards the east 

 along with these rocks a great series of sandstones comes on 



Lower PI. 

 Cenomanian. 



