420 



THE GEOLOGIST. 



Metres. 



8. Bed of Bryozoa 0-20 to 0-80 



9 Hardened rock, encrusted by serpnlse, bryozoa, and 



oysters 0-60 to 0.70 



10. Craie tujfeau, formerly worked at Bemeleu and Geulhem 



as a biiiiding-stone 6*00 



11. Extremely hard and compact rock, containing numerous 



organic remains, amongst which are Belemnitella mncro- 

 nata, Bentalium Mosa, Area, Spondi/lus, SfC. ... 0-30 to 0.40 



12. Second bed of Bryozoa I'OO 



13. Stratum of very hard rock, inclosing a great number of 



lenticular concretions covered with cellepores, bryozoa, 



and serpulse 0-50 to I'OO 



14. Craie tuffeau, with fossils Heyiiipneicstes radiatus, Mesosti/lus 



Faiijasii, 12*00 



15. Stratum containing a second bank of oysters, nearly 



entirely composed of Grijphaa vesicularis 0"oO 



Herr Bmkhorst notices as found in this bed teeth and other re- 

 mains of Mosasaiirus Camperi, and of species _ of Corax, Otodtts, 

 E)ichodas, Lamna, Spha;rodus, and P^/cnodus, with portions of the 

 carapace of the great marine turtle, Clielone Hoffmanni. 



16. Stratum of hard rock, containing but few fossils 0*30 



1 7 . Craie tuffeau, fossils rare 0*04 



18. Stratum containing many peculiar Bryozoa and other 



fossils, with remains of Mosasaurus and of Clielone Hoff- 

 mamii 0'22 



19. Craie tuffeau containing nodules of flint 1*00 



20. Stratum of very hard and compact rock containing nu- 



merous Gasteropods ■ and often very perfect imprints ; 

 casts of a small Turritella (T. socialis) are extremely 

 abundant, with those of Nucula ovata (Nilson) and 



excarinatum 0'30 



Remains of cretaceous plants and trees are also met with in 

 this bed. 



21. Craie tuffeati with beds of flint-nodules. 



It is not within our present limits to follow Herr Binkhorst minutely through 

 the details of the strata of his province, nor to notice those other portions of 

 this part of his book which treat of the Coal-measures and Tertiary deposits 

 of his duchy, although these too are highly interesthig, the one having been 

 illustrated by the admirable labours of Professor de Koninck, the other by the 

 equally valuable productions of M. Nyst and Sir Charles LyeU. With these 

 and other topics we may deal when the author presents us with a second 

 portion, considering it sufiicient at present to draw attention to a work wliich, 

 if not so complete as we could msh, must still prove, through the full ac- 

 count it furnishes of those singular cretaceous deposits so rich in fossil organic 

 remains, of very considerable service to all geologists visiting the interesting 

 district of Maestricht. 



