282 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
the same, or about 45° west. Counting from above you would thus 
have: 
Conglomerate, 
Lime, 
Conglomerate, 
Lime, 
Sandstone. 
This might indicate two distinct periods of formation, but as the con- 
glomerate on both sides of the lime seems to be entirely identical and 
the lime itself differs widely from the stratified lime farther east, and 
shows no signs of fossils, I would assume it to be of much later origin 
and due to infiltration. 
The fossils I have been able to collect are not numerous, but I trust 
they will be sufficient to determine their age. 
The reported coral reef at Aguas Calientes in Cartago, which was 
visited by request, proved to be caleareous tufa. Тһе formation is 
going on to-day, and is due to precipitation of lime and magnesia from 
thermal springs in the vicinity. It looks at a distance somewhat like 
a coral reef. 
