ZONE OF AEGOCERAS HENLEYI. 



91 



No. 



12 

 13 



14 

 15 



16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 



27 

 28 

 29 

 30 

 31 

 32 

 33 



Petrology. 



Oyster bed (the lowest) 



Hard, whitish, slippery shales, irregular 



doggers 



Similar shales, irregular doggers 



Similar shales, irregular bands 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 — 1 in 



Whitish crumbly shale 



Dogger 



Shale and irregular dogger 



Shale 



Brown shale, hard band of 



Shale 



Thick- 



ness. 



ft. in. 



5 



4 9 



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. 



Gryphcea cymbium, var. depressa. 

 Aeg. Henleyi, Pholadomya Beyrichii. 



Jeff. Henleyi. 



Aeg. Henleyi, Modiola scalprum. 



Monotis incequivalvis. 



Aeg. Henleyi, Inoceramus ventricosus, Modiola 



numismalis. 

 Aeq. Henleyi. 



Lytoceras jimhriatum. 

 Ly tocer as fimbr latum. 



The base of the Henleyi-heda. 



Foreign Correlations. — The Henleyi = 6%?r2co;-«w«-beds are found in different regions 

 of North Germany, where they have been discovered in cuttings for raih-oads 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 locaHties in North Germany. 



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

 Saxony, by Ewald -^ near Gottingen, by Bornemann -^ 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 2)ai;«?«-beds = Henlei/i-heAs, of North Germany. 



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

 Akademie,' 1859, p. 354. 



2 ' tJber ^die Jurassischen Bildungen der Provinz Sachsen ;' ' Verb. d. Ron Akad. d. Wissench. 

 Berlin,' p. 347, 1859. 



* ' Liasformation in der Umgegend von Gottingen,' p. 23, 1854. 



* ' Den Eisenstein des mittleren Lias im N.-W. Deutschland,' p. 48/ — 496, 1863. 

 6 ' Der untere Jura im N.-W. Deutschland,' p. 133, 18/1. 



