DEVONIAN AND OLD UED SANDSTONE SYsTKM 219 



lent iciilar limestones, is about 900 feet thick ui-ar Givet, and is 

 divisible into several zones, as follow : 



Shales of Matagne or zone of Buchiola retrottriata. 

 Shales and limestones with many fossils. 

 Zone of Camarophoria and Rltynchonclla pugnus. 

 Zone of Spirifer orbelianus. 



In the northern part of the basin, near Frasne, the whole stage 

 consists of limestone which is supposed to be 1600 feet thick. The 

 species Rhynchonella cuboides, Pentamerus breinrostris, Gephyrocerat 

 intumescens, and Geph. complanatum range throughout 



The higher stage, Famennian, exhibits two distinct fades, the 

 southern argillaceous and the northern arenaceous. The former 

 has been divided into four zones, as follow : 



Etrreungt limestone with Spirifer distant. 

 Shales with Rhynck. letiensis. 



Jthynch. Dumonti \ , 

 Rhynch. 0,nali V *i ) and 



Along the northern border it consists of shales and sandstones 

 which have been divided as follows by Professor Gosselet : 



5. Shale and limestone (thin and possibly Carboniferous). 

 4. Sandstones of Dumont, soft brown and micaceous. 

 3. Calcareous shales of Choisies. 

 2. Flagstones of Cerfontaine. 

 1. Green shales of Colleret. 



The upper sandstones contain CuculUea Hardingi, C. trapezium, 

 and Palceopteris hibernica. They resemble the Marwood Beds of 

 North Devon. 



4. Germany 



The typical development of the Devonian in Germany is that 

 of the Rhine valley and the neighbouring hill districts of the 

 Eifel, the Hunsruch, and the Taunus. The region is actually 

 connected with the Ardennes, and the succession is very similar, as 

 will be seen from the following tabular description : 



^ /"Nodular limestone and shale with Clijinenias. 

 gl Shales with Entomis and Posidonomya venusta. 

 s~\ Calcareous shales of Budesheim with Gephyrocerai intumesccns. 

 ^ (.Limestone with Rhynch. cuboid.es and Camarophoria formosa. 

 ffl' /Limestone with Stringocephalus (1'200 feet). 

 .^ j ulv -^Crinoid limestones (30 feet). 



Si ( Marly limestone with Calceola, Spirifer speciosits, Phacopt 



& I Eif J Schlotheimi, etc. 



[Shaly limestone with Spirifer cullrijugatns. 



