PHYSIOGRAPHY OF THE PHILIPPINE ISLANDS. 3 



and southern Luzon. Both series are present in the northern part of 

 the island, but the northwest series is soon lost to the southwest and the 

 last prominent northeast feature on the main range of the island is 

 Port Palanoe. In addition to these two principal series of lineaments 

 there is, in the northern part, a third, minor series showing the northern 

 trend developed more extensively in western Panay and Tablas. 



PORT BAREEKA. 



Port Barrera is a deep bay cutting far into the land in a general 

 southwesterly direction. It is S-shaped, the deepest and widest part 

 running westerly for about 4 kilometers. This part is about 3 kilo- 

 meters wide and reaches a maximum depth of 60 meters. Southward 

 from Point Matalantalan the bay narrows and shoals rapidly, a marked 

 submarine escarpment running westerly from the northern part of the 

 east shore to the coral reefs outside Point Matalantalan. This stretch of 

 the bay extends southward for about 4 kilometers and is comparatively 

 narrow, not over 1 kilometer wide, and shallow, nowhere over 6 meters 

 deep. At Point Lungib the direction changes to southwest and the bay 

 broadens out and becomes much shallower, being bordered by large 

 mud flats and mangrove swamps. A well-defined channel, however, 

 extends as far as the village of San Agustin. 



A very peculiar feature of the topography of Port Barrera is the 

 complete dissimilarity of the two sides of the bay, the western consisting 

 of limestone terraces of apparently rather recent date, and the eastern 

 of a series of older rocks eroded to a much greater extent than the 

 limestones of the western side. 



Punta Colorada owes its name to the bright red color of its cliifs and 

 is said to be formed of iron-stained limestone. Tlie country across the 

 western arm of the bay from Punta Colorada consists almost entirely 

 of coralline limestone in a series of terraces. Running northwesterly 

 from Point Lungib the limestone forms a high, sharp ridge, with two 

 prominent terraces. It breaks ofE steeply on the northeast side into a 

 long, narrow valley separated from the bay by a smaller ridge. At the 

 corner of the western branch of the bay the larger ridge joins a south- 

 westerly escarpment of a similar limestone. To the southwest the main 

 ridge slopes off comparatively gently to an irregular plateau, the floor 

 of which is formed by one of the more resistant limestone beds. Farther 

 to the southwest there are a great number of small, conical mesas. 



In the southern part of the bay the southwestern series of lineaments 

 is represented by a line of hills running southwest from San Agustin. 



THE AEOEOT DISTRICT. 



The country to the east of Port Barrera shows a strikingly difllerent 

 topography. 'WT.iile the western side is the result of recent elevation 

 of coral limestones, the eastern shows a topography dependent on the 



