352 Synoptical Table of Miner ah and Fossils 



novitiate reader on geology, that useful information on the 

 anatomy of the Ventriculites is given in this Magazine (II. 

 332—341., III. 269, 270.] 



Radidria. — Ananchites, figured in Mag. Nat. Hist.,, iii. 278. : 

 flint, numerous. Galerites Conulus Mag. Nat. Hist. iii. 278. 

 Spatangus cordiformis Woodward's Geol. of Norfolk, t. 5. f. 6. ; 

 S. planus Geol. Suss., t. 17. f. 9.; S. excentricus Woodward's 

 Geol. of Nor f. t. 1. Cidaris corollaris Geol. Suss., t. 17. f. 2. 

 Echinital spines in flint. 5pongia: numerous specimens, 

 similar to those figured in Mag. Nat. Hist., iii. 268. 



Conchiferce. — Inoceramus Crips? Geol. Suss., t. 27. f. 11.; 

 I. undulatus Geol. Suss,, t. 27. f. 6. ; I., fragment of a large 

 variety in flint, " with siliceous casts of cells formed by 

 some parasitic animal." (t. 27. f. 7.) Inoceramus Geol. Suss., 

 t. 19. f. 20. Plagiostoma brightoniensis Geol. Suss,, t. 25. 

 f. 15. ; P. aspera Geol Suss., t. 26. f. 18. Pecten nitida Geol. 

 Suss., t. 27. f. 9. Belemnites Geol. Suss., t. 16. f. 1. Hamkes 

 baculoides Geol. Suss., t. 7. f. 23. 



The greater portion of mineral matter composing our gravel 

 are flints, generally in a broken and shattered state ; and the 

 whole are embedded in a ferruginous and siliceous sand. In 

 some pits there are partial beds of almost pure sand ; and, in 

 most of the pits in this parish, the bottom beds are composed 

 entirely of that mineral : the whole thickness of sand and 

 gravel averaging about 35 ft., as stated in p. 349. 



Although the flints are generally in a broken state (as 

 above noticed) in the gravel of this [Essex] and both the 

 neighbouring counties of Suffolk and Norfolk, yet in one 

 direction hence, namely, north-east, they are found to occur 

 larger and larger as we approach the chalk formation. This 

 is manifested in a striking manner within about three miles 

 of Sudbury, where the chalk is found in situ. At this 

 place there is a considerable hill, which consists of an accu- 

 mulation of large whole flints embedded in sand, with a small 

 portion of chalk rubbish. As this hill is quarried for the 

 flints for building rough inferior walls, cottages, &c, a good 

 opportunity is afforded for surveying its contents. These 

 consist of flints of the largest size : many of them are like 

 those in the chalk near Norwich, termed, by Professor Buck- 

 land, " Paramoudras." From these flints being so near their 

 native bed (the chalk), they are as angular and as whole as 

 those taken fresh from their native matrix, and present a 

 striking contrast to the broken state of the flints found at a 

 greater distance from the chalk. The construction of this 

 hill is contrary to the laws of gravitation, as many of the 

 largest flints occur near the top as well as at the bottom. 



