42 GEOLOGICAL MEMOIRS. 
Alberti separates the variegated marls with gypsum, under’ the 
name of keuper gypsum, from the keuper sandstone, only for con- 
venience. The carbonaceous slates are generally covered by dolo- 
mite, the higher part of which is rich in petrifactions; otherwise 
this group consists of gypsum with marls also contaming dolomitic 
rocks. Alberti conjoms with the dolomite between the slates and 
the gypsum, which only differs from the dolomite of the muschelkalk 
by its position and greater richness in fossils, the ‘ Reptilian-breccia,’ 
the lower ‘Gang-breccia’ of Pheninger, which accompanies it, and 
consists of marl six feet thick and full of remains of fish and copro- 
lites (Golsdorf, Rottenmunster). As representing the saurians the 
Limeville reptile is named, under which title the Nothosaurus must 
rather be understood than the Simosaurus, which more rarely occurs in 
Wirtemberg. In the gypsum also, above the dolomite, remams of 
reptiles, fishes and coprolites occur. 
The division of the keuper sandstone consists of marls, of fine- 
grained or argillaceous sandstone (the Schilfsandstem of Jager), of 
siliceous sandstone, of coarse-grained sandstone (Stubensandstem), 
and of a sandstone very rich in petrifactions. The fine-graimed sand- 
stone, well known for its vegetable remaims, furnished near Heil- 
bronn the impression of the jaw deprived of the teeth, and the 
osseous plates (Knochenplatten) of a large reptile. I have not — 
myself seen these remains ‘and only-follow the statement of Alberti. 
In the coarse-grained sandstone at Waldenbuch and Dirrheim bones 
were found, said to be those of a reptile; and from the same sand- 
stone the bones found near Ribgarten, and described by Jager as 
Phytosaurus, were also derived. The sandstone rich m organic 
remains, often named the sandstone of Tibingen, is frequently so full 
of osseous remains of saurians and fishes, along with coprolites, as to 
form a. bone-breccia, and Alberti quotes from it large teeth of the 
Liimevule reptile. . This sandstone forms the highest bed of the 
keuper. It must not be confounded with the bone-breccia resting 
upon it, in which at Stuttgart, Bebenhausen and other places, re- 
mains of fish, teeth, scales and coprolites are found, for this breccia 
forms the transition to the lias, and must be considered the lower lias 
sandstone. Reptiles are not mentioned from it. This is the highest 
of the beds of bone-breccia, already discovered by Alberti on the 
two limits of the keuper formation. Plieninger* names it the 
‘Upper Gang-breccia,’- and considers it as identical with the ‘bone- 
beds’ of Aust Cliff, Axmouth, and other places in England. Ac- 
cording to him the species of fossil fishes that occur in it in Wur- 
temberg are partly identical, partly distinct, from those in the 
‘ Gang-breccia’ which is situated at the lower limit of the keuper and 
belongs to the slate-clay (Lettenkohle). The saurian remams from 
the keuper of Schwabia have been partly published by Jager}, partly 
by Plieninger and myself{, and m this work I shall have further 
communications to make. ~ 
* Amt. Bericht. der Naturf. in Bremen im Jahr. 1844. 
tT Fossile Reptilien Wurtemberg’s. 
+ Beitrage zur Palaontologie Wiirtemberg’s. 
