5^/^ PVRITES. 6^ 



bf clay, about an ell mighty ; ufually employed 

 for making retorts, and the like veftels, that are 

 to endure ftrong open fires. Sixthly, a grey fand 

 layer, the depth of which is hitherto unknown. This 

 account, together with famples of the ftrata^ I had 

 from a perfon of reputation, living on the fpot. 

 Now here the ftrata are not difpofed, as if an 

 effect of the flood, but quite in an inverted order. 

 It is alfo very remarkable of the Eifleben mines, 

 according to M. Mylius * \ that we find, t. The 

 underturf earth reaching from three to four fathom 

 deep. 2. Loam. 3. Red clay. 4.Blueclay. 5. Fine 

 fand, a fathom and a half deep. 6. Red fand-rock, 

 three fathom deep. 7. A quaggy, foft layer, 

 twelve fathom deep, but not in all places. 8. A 

 loofe, fpungy layer, three fathom deep 9. The 

 afhes, three fathom deep, quite to the rock : tho* 

 thefe layers have happened to be difpofed tolerably 

 well in refpect to gravity and lightnefs, coarfenefs 

 and finenefs. In other parts, tho' not in all, of thefe 

 mines, the firft layer is Sod. 2. Earth. 3. Loam. 

 4. A fort of common round (tone. 5.Coarfe quick- 

 fand. 6. Redquick-fand. 7. Yellow quick-fand. 8. 

 White quick-fand. 9. Black vein ftone. 10. Brown 

 wood- vein-ftone. n. Red vein-ftone. 12 Red 

 clover. 13. Red feamy vein-ftone. 14. Coarfe lime- 

 ftone. 15. Lime-ftone. 16. Specular lime ftone. 

 17. Clay round-ftone. 18. Loofe fpungy- ftone. 19. 

 Kneifs y &c. And tho' many ftrata of earth may 

 have taken their natural pofitions, yet they never 

 confift of entirely fimilar particles 5 and in the chalk, 

 alfo in the fine clay of Waldenberg are found 

 pieces of the black and grey chalcedon or com- 

 mon flint : yet the deluge has caufed great al- 

 terations on the furface -, as having here covered 

 a country with pure fand, there with flime •, alfo 

 introduced fuch a degree of confufion, fo as to 

 make it fcarce poffible for each Jlratum of earth to be 



F unmixed 



* M>lii Saxon, fubtcrr, P. I. p. :o, & f ■]. 



