io8 Bulletin 5 378 



Between Loutre island and Cote Sans Dessein, compact 

 limestone occurs, in horizontal strata, along the sides of the 

 Missouri valley. It is of a bluish white colour, compact 

 structure, and a somewhat conchoidal fracture, containing few 

 organic remains. It alternates with sandstones, having a si- 

 licious cement.* ■ * * * * 



\_Foot note, page 84] . 



* From Bay Charles hill, 4 miles below Hannibal, Missouri, we receiv- 

 ed, through Dr. Sommerville, several organic remains. Among them are 

 the following : 



Carbonate of Lime : 



One specimen contains exclusive quantities of segments of the Encri- 

 nite of small diameter, from 1-4 of an inch down to minute. 



Another specimen also with numerous small Encrinites has a very- 

 wide and short radiated Productus. 



Another specimen a grayish chert, containing cavities formed by the so- 

 lution and disappearance of encrinites, the parts of these which were ori- 

 ginally hollow when in the state of carbonate of lime, being subsequently 

 filled with chert, now show the nature of the fossil, being cylindrical ca- 

 vities, with a solid centre and transverse partitions — the largest 3-ioths of 

 an inch wide. 



From Rector's hill, adjoining the village of Clarksville, Missouri, from 

 Dr. Sommerville 's collection : 



A specimen of oolite — carbonate of lime. 



It is composed of small spherical granules in contact with each other, 

 which, in their fracture, exhibit rather a concentric tendency, with the ap- 

 pearance of a central nucleus ; but we could not perceive any decided evi- 

 dences of former organization in them. Imbedded in the mass are a few 

 columnar segments of encrinites, and a portion of a compressed bivalve, 

 which, in the form of its radiating lines, resembles a pecten. 



From Charboniere : 



A specimen in argillaceous sandstone of a portion of a leaf like the 

 Nelumbium — It is only the middle portion of the impression of the leaf 

 that remains, being of an oval form of about five inches in greatest di- 

 ameter, the rest being broken away ; the stalk has been broken off at the 

 junction of the leaf. 



Productus spiiwsiis. Say. 



A small species of terebratula, in width two fifths, and in length more 

 than seven-tenths of an inch — an internal cast — ^individuals very numer- 

 ous, varying much in size, the smallest being about one-fifth of an inch 

 wide. 



From the Mammelles near St. Charles : 



Productus : a portion of a valve, and smaller portion of the oppo- 

 site valve of a remarkably large species, of which the proportions may 

 have been not dissimilar to that of the Ency. Meth. pi. 244, fig. 5 — the 

 striae are similar to those of that shell, except in being somewhat 

 smaller, and the groove of one valve, and consequent elevation of the 

 other, not so profound, less abrupt, and more angular in the middle, and 



\_Foot note, page ^5] . 

 far less prominent on the edge of the shell. It 'may justly be named 

 grandis, as its hinge width was more than 3 1-2 inches. 



[Long's Expedition to the Rocky Mountains, Vol. I, 1823]. 



