CONTENTS. xiil K 5. Metalliferous nature: 6. Geographic diftribution. ■—4. CI ay.flat e : 1. Different kinds : 2. Stratification : 3. Foreign beds : 4. Shape of its mountains, and gene ral obfervations on the form of cliffs and valleys : 5. Its metalliferous nature : 6. Geographic diftribu tion.—5. Primitive limeflone : 1. Defcription : 2. Strati fication : 3. Different formations of primitive lime- ftone : 4. Metalliferous nature : 5. Geographic diftri- bution—6. Primitive trap : 1. Origin of the name : 2. Defcription of the different kinds, with a detail of their geognoftic relations—7. Serpentine>: t. Defcrip tion : 2. Stratification : 3. Formations : 4. Age: 5. Its affinity to rocks of the trap-formation : 6. Its fre quency. 8. Porphyiy : 1. Origin of the name : 2. De- •feription : 3. Stratification : 4. Foreign beds: 5. For mations : 6. Metalliferous nature : 7’. Geographic dif tribution—9. Si*nit e : 1. Origin of the name : 2. Con- -'fhtuent parts : 3. Stratification r 4. Foreign beds : ' “3: Pofition Metalliferous nature : 7. Geographic diftribution.-—-ib. Topaz-rock : 1. Conftituent parts, and ftru&ure: 2. Stratification: 3. Pofition: 4. Geo- - graphic diftribution.—11. Quartz rock : 1. Defcrip- • non : 2. Pofition : 3. Foreign beds : 4. Geographic diftribution.-—12. Primitive flinty-flatc—13. Primitive gypfum.—14. Whiteflone. CHAP. VII. Class II.-— Franfition Rocks} Uebergangsge- birge, Werner, . . p age H5 General obfervations, and enumeration of the different tranfition rocks, l.Tranfltion-limeflone. 2. Tr unfit ion- trap: