CLAYS OF NEW YOKK 619 



sively worked around Baton Kouge; they make a good quality of 

 building brick but at many places they are covered with a great 

 thickness of loess. SimalaS* clays of the same age form a series of 

 bluffs on the western side of the present Mississippi valley from 

 the Arkansas state line to the Gulf of Mexico. These clays have 

 been worked at Marksville, Washington and "New Iberia. At the 

 latter place a good dry pressed brick is made from them. 



A third group of clays comprises a series of pocket-like deposits 

 in modern alluvium of the Eed river. They probably represent 

 abandoned portions of the river bed. In addition to these three 

 main groups of clays, others of Lafayette age occur in northern 

 Louisiana. Lignitic shales are also found in certain portions of 

 northern Louisiana near Shreveport. These may perhaps be suit' 

 able for the manufacture of paving brick. 



Maine 



The clay industry of Maine is on the decline. There are a num- 

 ber of brick yards along the coast, which in former years sent 

 their product to Boston, but the establishment of local yards 

 around the latter city has had a bad effect on this trade. Two 

 stoneware potteries, one at Portland, the other at Bangor, are still 

 in operation, but they draw their material largely from other 

 states. The clays found in Maine are all of Quaternary age. 



Maryland 



This state supports an active <3lay-working industry, but little 

 is known concerning the raw material. Kaolin and pottery clays 

 are said to occur at a number of localities. In the western portion 

 of the state, at Mt Savage, occur important deposita of flint and 

 plastic fire clays. The Devonian shales are employed for paving 

 brick, and in the Potomac formation around Chesapeake bay, 

 there are large quantities of clays of different grades. 



