98 The Ayyierican Geologist. Autfust, laai 
professor Yon Seebach cited Cardium palmatum Goldfs, { = C.retro- 
striata A'on Biich ) from the Wissenbacher ( ( loslarer ) sehiefer of 
the Hartz, and F. Maurer, in "Die Thonschiefer des Ruppbach- 
thales V»ei Diez "* describes a form ver\' similar to (\ retrostriata 
from tlie Wissenbacher-scliiefer of tlie Kliine. * Barrande has 
also cited it from a still earlier horizon, his etage E, as he does 
also from the higher etage H, which may be nearer the plane of 
its normal maximum development in other faunas. Barrois has 
shown that the shales described by Casiano de Pradof as the 
" Schistes a Cardiola retrostriata de la Collada de Llama," in the 
Province of Leon, Spain, are of equivalent age to the Wissen- 
bacher-schiefer of the Rhine. + 
This idontilication is of much interest on account of the close simi- 
larity of the fauna of these black shales and the normal fauna of the 
Marcellus black shales. The black Cardiola retrostriata shales are de- 
scribed as "fins, amp61iteux et argilo-ferrugineux." They have furnished 
but few species : 
Ptuicops latifrons Bronn, cf. Ph. rana (Marcellus.shales) 
Gonidtites cf. oecultns Barrande, cf. f f O. difinoklcus " 
Orthoceras regnlnre Schlotheim, cf. 0. suhulatum " 
Bactritcs schlotltcimi Quonstedt, cf. B. clavus " 
Pleurouwmria subcarinata F. A. \. ^f. p, rugnlat^ 
Roemer ) '' 
Posidonomya pargai de Verneuil, cf.Ptcrinea Itevis Go]dfs. var.arjicri- 
cana d'Orbigny (Marcellus shales) 
Cardiola retrostriata von Buch, idem. 
RetzianovempUcata, cf. f Leiorhynchus Umitaris (Mar- 
cellus shales). 
Its horizon of maximum and characteristic development, how- 
ever, wherever the specialization of the component elements of 
the upper Devonian faunas is more pronounced is below the normal 
horizon of Spirifer disjunctus and above that of RhynchoncUa 
cuhoides. It is a usual member of the Intumescens fauna, but it 
is present at this liorizon when the goniatite facies is wanting. 
In the north of France and on the Belgian frontier the " Schistes 
a Cardinm 2)almatum '" are assigned the following position by 
Gosselet. ? 
Schistes de Faraenne, with Spiri/cr disjunctus, Rhynchonella 
pugnus , Productus subaculeatns; also Rh. cuhoides. 
Schistes a Card iuin palmatum, with Goniatites retrorsus. 
Schistes a nodules argilo-calcaires, with Rli. cuhoides, Afrypa 
reticularis, Spirifer euryglossus. 
♦Neues Jahrbuch fiir Min. 1870, p. 25. 
jNote gtologlque sur les Terrains de Sabero et de ses environs dans 
les montagnes de L6on (Espagne); Bull. Soc. geol. France, 2d ser. torn 
vii, p. 137, 18.50. 
JNote sur le Terrain dt^vonien de la Province de L^on (Espagne); 
Assoc. Franc, pour I'Avancement des Sciences, 1877. 
§Annales des Mines, ser. fi, torn xii, p. 505, 1807. 
