ZONE OF AEGOCERAS HENLEYI. 



91 



Thick- 



ness. 



ft. in. 



5 



4 !) 



4 6 



5 



11 



2 



2 10 



8 



15 6 



6 



8 4 



4 6 



5 



3 



4 5 



5 



5 



6 



11 



4 



3 



5 3 



128.2 



Organic Remains. 



Oyster bed (the lowest) 



Hard, whitish, slippery shales, irregular 



doggers 



Similar shales, irregular doggers 



Similar shales, irregular bauds of 



doggers 



Similar shales 



Small round nodules 



Darker shales, still hard 



Strong ironstone dogger 



Bluish, hard, sandy shale 



Ironstone dogger, 6 — 8 in 



Similar shale 



Ironstone dogger 



Similar shale 



Thin lenticular dogger 



Similar shale 



Ironstone dogger, 5 — 10 in 



Whitish crumbly shale 



Dogger 



Shale and irregular dogger 



Shale 



Brown shale, hard band of 



Shale 



GryphcBa cymbium, var. depressa. 

 Aeg. Henleyi, Pholadomya Beyrickii. 



Aeg. Henleyi. 



Aeg. Henleyi, Modiola scalprum. 



Monotis incsquinalvis. 



Aeg. Henleyi, Inoceramus ventricosus, Modiola 



Aeg. Henleyi. 



Lytoceras flmhriatum. , 

 Lytoceras fimbriatum. 



The base of the Henleyi-heds. 



Foreign Correlatiotis. — The Henleyi = Capricornus-heds are found in different regions 

 of North Germany, where they have been discovered in cuttings for railroads and in 

 mining for ironstone, which appears to abound in the lower portion of the Middle Lias 

 of that country ; in proof, I may state that Ammonites Capricornus has been found in 

 forty different localities in North Germany. 



In Brunswick this zone has been described by H. von Strombeck •} in the province of 

 Saxony, by Evvald ;" near Gottingen, by Bornemann f at Harzburg, Oldershausen, 

 Markoldendorf, and in other ironstone districts, by Dr. U. Schlonbach ;* and from these 

 and other localities Dr. Brauns^ has been able to make out the following list of species 

 forming the Molluscan Fauna of the Davm-h^ds, = Henlep-hed^ of North Germany. 



1 'Zeitschrift der Deutschen geol. Gesellsch.,' vol. iv., p. 65, 1852; ' Sitzungber. der Berliner 

 Akadernie,' 1859, p. 354. 



2 ' tJber |die Jurassischen Bildungen der Provinz Sachsen ;' ' Verb. d. Eon Akad. d. Wissench. 

 Berlin,' p. 347, 1859. 



' ' Liasformation in der Uragegend von Gottingen,' p. 23, 1854. 



* ' Den Eisenstein des mittleren Lias im N.-W. Deutschlaud,' p. 487—496, 1863. 



5 ' Der untere Jura im N.-W. Deutschland,' p. 133, 1871. 



