. II. RELICS. Phenomena. 7 



animal or vegetable, are rarely found in a fos- 

 silized state. 



o. Shells, and various marine exuvite of the ver- 

 ities class, without the intermixture of other organic 

 remains, are most commonly found in the strata im- 

 mediately reposing on, or following tracts of granite, 

 gneiss, and the other rocks, in which extraneous 

 fossils are never imbedded. 



p. Strata containing the remains of fish and ma- 

 rine shells, &c. mixed sometimes, with the parts of 

 amphibious animals and plants or those in which ve- 

 getables only occur generally succeed, or rest on the 

 tracts, in which the exuviae ofvermcs alone are found. 



q. The remains of land-animals, particularly of 

 the class mammalia, rarely occur in regular strata 

 When they do, the strata are usually superficial ; 

 overlaying, but never dipping under, beds of other 

 formation. 



r. Animal rcliquia, particularly the marine, 

 though not confined to, are most common in calca- 

 reous strata. 



s. Vegetable reliquia frequently occupy inde- 

 pendent argillaceous beds, especially those produc- 

 tive of coal. 



t. But strata containing vegetable remains only, 

 or vegetable remains mixed with fluviatile shells, 

 &c. sometimes (though not often) alternate with 

 strata, in which marine relics are found, f 



f Coal-beds and their accompanying argillaceous strata, holding 

 only vegetable remains, have, in some parts of England, been found 



