Geological Society of Pennsylvania. 427 



fossil coal plants, a specimen of each variety, and will you note 

 the localities from whence they have been taken ^ 



11. Upon what general bed does the coal-field he ; is i lime- 

 stone, sandstone, clay, shale, or what other simple mineral ? 



12. Which of the foregoing substances do the strata ot coal 



alternate with 1 



13 Will you procure for the Society geological specimens, 

 not exceeding four inches square, of the general bed under the 

 coal-field mentioned in query 11, as well as of the alternatmg 

 beds spoken of in query 12, together with good ^Pe^rnens of 

 every species of fossil organic remains found in all such beds, 

 noting their localities 1 _ 



14. Are any salt springs, or mineral springs, or is any roclJ 

 salt found in your County, and whereabouts] 



15. What is the depth of the wells which have been dug lor 

 brine, and through what mineral beds were the borings made? 



16 Will you procure for the Society a perpendicular section 

 of such borings, with the thickness of the various beds, and fos- 

 sils found in them 1 . 



17 Will you procure for the Society, geological specimens, 

 not exceeding four inches square, of the rocks of which the 

 mountains and hills alluded to in query 5 are composed together 

 with specimens of organic remains, preferring such as have por- 

 tions of the rock adhering to them^j 



18 Will you procure for the Society a perpendicular section 

 of any cUtfs, or the banks of any ravines, or streams m your 

 County or Township, giving an accurate description of the va- 

 nous beds of which, they may be composed, with the respective 



thickness of such beds 1 , . i • 



19 Will you furnish the Society with geological speci- 

 mens of such beds, and their fossils, prepared as suggested in 



"^""^l Are there any natural caves in your County or Township ? 

 in what formation are they found, in limestone, sandstone, or 

 what bed, and whereabouts are they ? ,. ., , i 



21. Can you give the society information of any fossil skele- 

 tons, bones, or teeth of ancient animals, found in them? 



22. Were they found laid on the floor of such caves, or were 

 they dug from beds of earth within the caves, and at what depth ? 



23. Were such beds of earth covered over with a crust of 



