Suburban Geology of Richmond, Indiana. 305 



2. Milky quartz. 



3. Sandstone. 



4. Hornstone. 



5. Jaspery iron ore. 



6. White siliceous pieces, with encrini, &c. 



7. Colored siliceous pieces, with small Pentamera. 



8. Amygdaloid. Base green ; amygdalas black. 



9. Porphyry. White feldspar in green epidote, with groups 

 of large hexahedral prisms of epidote on the surface. 



10. Cellular quartz. Some specimens with veins, of blue 

 quartz, and splendid minute crystals of the same, lining fissures 

 in the bowlders ; other specimens have a well marked, oolitic 

 structure. 



11. Striped jasper. 



] 2. Siliceous masses of Favosites, Tubularice, and madrepores. 



13. Dark brown sandstone, with branched corals and small 

 aviculce. 



These cannot be considered common : some of them are rare. 



14. Large blocks of pale red and other colored quartz are not 

 of unusual occurrence. 



15. Hornblende rocks. 



16. Several varieties of puddingstone. 



17. Masses of beautiful breccia, having a whitish base set with 

 hornstone, and bright red and other colored jasper. Rare. 



18. Siliceous slate. Not common. 



19. Clay slate. Not common. 



20. Common jasper. Frequently found. 



Calcareous. 



1. Fetid carbonate of lime. Some pieces with fine large crys- 

 tals of white foliated sulphate of strontian; other blocks contain 

 numerous small bivalves, closely resembling Cytherinai. Of fre- 

 quent occurrence. 



2. Calcareous tufa, from deep excavations in the diluvium. 

 Common. 



3. Compact brown limestone with quartzose concretions, and 

 a small trilobite, encrinites, Favosites, a Delthyris ? Cyathophylla, 

 and other madrepores. Rare. 



5. A brown bowlder highly charged with iron, and divided in 

 every direction by thin plates of sulphate of barytes. Rare. 



Vol. xliv. No. 2.— Jan.-March, 1843. 39 



