1853.] HENEKEN — SAN DOMINGO. 127 



These fossils may be considered more or less as erratics. They 

 seem to appertain chiefly to the remains of pre-existent strata that 

 once covered the plain. 



Some belong to the blue shale, others to the tufaceous limestone, 

 and many may be recent. They are generally in a bad state of pre- 

 servation, being broken and vporn, as if by attrition. 



At Inamagado there are traces of the blue shale vrhich has not 

 been entirely denuded ; consequently the fossils from thence are more 

 numerous, and approach more in character to those of Postrero and 

 Cercado. Still there is a difference, and it may be remarked with 

 regard to these fossils from the sandstone plain, that some particular 

 species more or less predominate to the exclusion of others, some of 

 vfhich seem to be peculiar to each locality, however near they may 

 approach to each other. These several local collections were hastily 

 made during marches and military service, and for many reasons can 

 scarcely be regarded as more than approximately correct represent- 

 atives of the fossil faunas of these districts. 



Inamagado. — This is merely the name attached to a tract of 

 grazing farms. Here, as I have already observed, are traces of the 

 blue fossiliferous shale ; there are also traces of the upper bed No. 5 

 of Cercado (argillo-calcareous shale), and there is a similarity in many 

 of the fossils to those of Postrero and Cercado. The angle of dip 

 was not satisfactorily obtained here. 



Esperanza. — The fossils at this place are scarce and in a bad 

 state of preservation. Numerous detached blocks of coarse sand, 

 more or less coherent and containing fossils, lie scattered over the 

 surface. They do not belong to the sandstone rock in situ, upon 

 which they immediately rest. Some of these specimens of fossili- 

 ferous grit appear to be identical with bed No. 2 of the more northern 

 cliff at Cercado. Dip of the sandstone strata S.W. by S. Z 25°. 



Rompino. — This place is situated on the River Cana, where it issues 

 from the deep narrow channel it has cut through the Samba Hills. 



The fossils from this place appear to be of a mixed character, 

 having reference both to the blue shale and the tufaceous limestone ; 

 some are perhaps peculiar to the spot. The argillo-calcareous shale 

 of Cercado prevails here, — dip N.N.W. Z 10°. 



Cerro Gordo. — The specimens collected here form a group differ- 

 ing in appearance considerably from all the others. I noticed, how- 

 ever, a large Coral, similar to one taken from the tufaceous lime- 

 stone at Rompino, and there may be other analogies. The specimens 

 were taken from a mound very much like an old coral-reef ; with 

 sandstone hills in the vicinity. 



San Lorenzo. — This is the name of a small village whose plan I 

 traced since the war, to accommodate the border population, forced 

 to retire from the vicinity of the enemy. It is now the head-quarters 

 of our northern line of cantonments. 



The specimens from this place were gathered upon sandstone hills 

 two or three miles to the north of it. The strata of these hills dip 

 S.S.W. Z45°. Considerable quantities of selenite are mixed with 

 the fossils. It is met with in the form of veins, and also massive, in 

 the shales and silt that overlie the sandstone superficially. 



