Correlation of the Meadfoot and Siegenian Beds. 165 
Correlation between the Meadfoot Beds of Devonshire 
and the Siegenian of the Ardennes (Lower Devonian). 
By Etienne ASSELBERGHS, D.-en-Sc. (Louvain), of the Geological 
Survey of Belgium. 
Sect. 1. 
N a study of the Lower Devonian of the “ Bassin de l’Hifel”’ 1 
the present writer established the following sequence in the 
Siegenian Beds (= Siegenerstufe of the Rhine) of the southern part 
of the Ardennes :— 
Upper: dark blue shales and slates. 
Upper Siegenian | Lower: quartzophyllades, often calcareous (lenticular 
or Hunsriickian. limestone of Bouillon), sandstones, and shales. Very 
fossiliferous. 
Lower Siegenian ) 
or Taunusian. if 
The Lower Hunsriickian has yielded an important fauna,? and 
the most characteristic species are: Proschizophoria [Orthis] 
personata (Zeiler) Kayser em., Stropheodonta Murchisoni Archiac 
and Verneuil, S. Sedgwicki A. and V., S. gigas McCoy, S. herculea 
Drevermann, Schuchertella ingens Drevermann, Spirifer hystericus 
Schlotheim, S. excavatus Kayser, S. primaevus Steininger, S. solitarvus 
Krantz, Rhynchonella papilio Krantz, R. Dannenberg: Kayser, 
Rhenorensselaeria crassicosta Koch, R. strigiceps Roemer, Uncinulus 
frontecostatus Drevermann, Cornellites Paillettec Verneuil and 
Barrande, Grammysia taunica Kayser, and Cryphaeus Drevermanni 
Richter. 
The purpose of this note is to show that the same succession 
occurs In Cornwall and South Devonshire. 
Dark blue slates and shales interbedded with quartzite. 
SECT. 2. 
The Lower Devonian of Cornwall is a quartzoschistose complex 
affected by numerous plications and dislocated by a great number 
of faults. Therefore the geologists who tried to establish a strati- 
graphical succession met with difficulties far exceeding those 
experienced by workers in the Ardennes. Nevertheless, they dis- 
tinguished three formations known, in descending order, as the 
Staddon Grits, the Meadfoot Beds, and the Dartmouth Slates. 
The Dartmouth Slates correspond to the Gedinnian of the 
Ardennes. On the other hand, the Staddon Grits are succeeded by 
1 Le Dévonien inférieur du Bassin de |’ Hifel et de l’Anticlinal de Givonne 
dans la Région sud-est de l’Ardenne Belge. Apercu général sur le Bassin 
de I’ Hifel entre la Meuse et la Kyll. Mém. Inst. géol. del Université de Louvain, 
vol. 1, 1913, pp. 1-175, pls. iii. 
* The fauna of this horizon of the southern border of the Bassin de Dinant 
has been made known by Béclard (Bull. Soc. belge de Géol., vol. i, 1887, pp. 60-96) 
and by Maillieux (ibid., vol. xxiv, 1910, Mém., pp. 189-220). I have given 
a critical list of the species collected in the Bassin de I’ Hifel (loc. cit., pp. 85-182). 
This list has been added to by Maillieux (Bull. Soc. belge de Géol., vol. xxviii, 
1914, Proc. verb., pp. 77-9). 
