CONTENTS. 



Page. 



Introduction 525 



Sedimentary formations 526 



Eocene (?) 526 



Bas Obispo formation 526 



Las Cascadas agglomerate 526 



Oligocene 526 



Bohio conglomerate 526 



Culebra formation . . 527 



Cucuracha formation - 527 



Emperador limestone 531 



Caimito formation 531 



Miocene 531 



Gatun formation * 531 



Panama formation 532 



Pliocene 532 



Toro limestone 532 



Chagres sandstone 532 



Pleistocene 532 



Descriptions of local sections across the Isthmus of Panama 532 



Section in canal cut 600 feet south of Miraflores Locks 533 



Section at Canal Commission station 2089 south of Miraflores Locks 533 



Section, north end of Miraflores Locks 534 



Section, Pedro Miguel Locks to Paraiso Bridge 534 



Section at Bald Hill near Miraflores Locks 534 



Section along east side of Gaillard Cut from Canal Commission stations 1843 



to 1850 535 



Section on west side of Gaillard Cut from Canal Commission stations 1775 



to 1756 535 



Section on west side of Canal Commission station 1720, near Empire, to 



1740 near Culebra 536 



Section on west side of Gaillard Cut near Las Cascades, Canal Commission 



stations 1617 to 1597 537 



Sections in cuttings of Panama Railroad near Caimito Junction 539 



Railroad cut near stream about midway between Rio Frijol and Rio 



Frijolito 539 



Section in railway cuts near New Frijoles 540 



Section showing chief railway cuttings and outcrops along the Panama 



Railroad between Bohio and Monte Lirio 540 



Exposure a quarter of a mile northwest of old Bohio railroad station 541 



Exposure opposite old Bohio railroad station, north side of the railroad 



track 541 



Section at Pena Blanca, about one mile below Bohio, on the west side of 



Chagres River 541 



Section at Vamos a Vamos, 2\ miles below Bohio, west side of Chagres 



River 542 



ni 



