414 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1908. 
a sketch (fig. 5) of the relation of these two 
formations, and upon sailing southward made 
a similar sketch (fig. 6) showing the relations 
of the bed as seen after rounding the point. 
The presence of the bubonic plague at Paita 
during the writer’s visit, and especially the 
establishing of the hospital to the west of the 
town, prevented a thorough examination of the 
locality. Grzybowski, in his article, mentions 
some shales cut by minute quartz veins which 
he found outcropping to the west of Paita near 
Paita Point. These shales, which were not well 
seen by the writer, were included by him in 
his sketch as a part of the Amotape formation. 
The division between the Amotape and upper 
formation shown in the sketch corresponds ap- 
proximately with the dividing line between the 
shales and sandstones of Grzybowski’s section 
at Paita® (fig. 7). Grzybowski has described 
what he calls the “ Paita stage” from the 
locality at Paita, and if it had not been for 
this the writer would apply the name Paita 
formation to the upper one, which he has 
differentiated. 
The age of the beds at Paita was not well 
determined by the fossils which Gabb received. 
He states that some of the fossils were extinct 
forms, and that the remainder appeared to be 
Pliocene. Grzybowski assigned the Pliocene 
age to his Paita stage. The writer thinks that 
the unconformity which he has shown in his 
section is unmistakable, and that accordingly 
he would call the upper beds Pliocene. The 
extent of this formation has not been deter- 
mined with certainty, but it apparently occu- 
pies the upper portion of the table-land of 
Paita. To the north, in the plains around la 
Brea hills, it is not to be found in extensive 
areas, since the good exposures which were 
seen all belong to the Amotape formation. 
The Brea hills were perhaps above the level 
of the sea during the time it was deposited. 
It may be more appropriately expected south- 
ward, underlying the desert of Sechura. 
SEAL ISLAND 
PAITA POINT 
SECRETS — 
Sy SN Se ete 
SEAS Le 
a 
ZL We 
v= 
% 
Be AS TN Ee ee 
“CHAIR OF PAITA’HILE 
Fie. 6.—Section of sea cliff to west of Paita. 
LEVEL OF PLATEAU 
Fic. 5.—Section of sea cliff at Paita. 
LEVEL OF PLATEAU 
sy) SR RAY 
PORT OF PAITA 
PAITA POINT 
“Original figure in Neues Jahrbuch fiir Mineralogie, Beilageband XII, Pl. 
XVI, fig. 1. 
