MUSEUM OF COMPARATIVE ZOOLOGY. 287 



EXPLANATION OF THE PLATES. 



PLATE I. 



Fig. 1. Geologic Section across the Island of Cuba from Havana to Batabano. 

 Scale, 5 inches to 1 mile. (1) Pre-Tertiary Formations. (2) Tertiary- 

 Limestones. (3) Soboruco Reef. (4) Mud Deposit of Batabanos. 



Fig. 2. Detail of Moro Plateau, North End of above Section. Figures have same 

 reference. 



Fig. 3. Dike near Water- Works, South Edge of Havana. (1) Dike Material. 

 (2) The same, more weathered. (-3) Supposed Cretaceous Clays. 

 (4) Surface showing Tertiary Limestone on right. 



Fig. 4. Geological Section of the Canon of the Rio Yumuri of Matanzas. (1) Mas- 

 sive Coralline Cantera, Reef Rock, 85 feet. (2) More Arenaceous Lime- 

 stone, with Molluscan Remains, 15 feet. (3) Stratified Calcareous Clay, 

 with MoUuscan Remains, 10 feet. (4) Same, with great number of small 

 Pebbles. (5) A very white Lime Material, with Bands of Clay. (6) At 

 Base. (7) Calcareous Matrix, with Pebble, 10^ feet. (8, 9, 10, 11) Mio- 

 cene Limestone with Molluscan Remains, becoming arenaceous at 

 Base (12). 



Fig. 5. Section at Baracoa. (a) Sea Level ; (b) Elevated Reef Level ; (c) Military 

 Hospital Level; {d) Cuchilla High Lands (1827), Yunque Level ; (e) Ra- 

 diolarian Hill. (1) Soboruco. (2) Miocene {1) Limestone. (3) Y'ellow 

 Clays with Miocene Mollusca. (4) Hill of Radiolarian Earth. 



Fig. 6. The Canon and Terraces of tlie River Yumuri of the East. Vertical height, 

 eOO feet. 



Fig. 7. Section near Aguacate, showing Decay of Limestone into Red Residual 

 Soil. 



Fig. 8. Ideal Illustration of the Epochs of Elevation in Cuba. (1) Soboruco or 

 Elevated Reef. (2) Cliffs of the Coast. (3) The Cuchilla Level. 

 (4) The Yunque Level. (5) The Sierra Maestra. 



PLATE II. 

 The Evolution of the Circular Harbors of the North Coast of Cuba. 



Figs. 1, 2. Mouths of simple Rivers, with Fringing Reefs growing off their Points. 

 (1) The Y'umuri of tlie East. (2) The Limones. 



Figs. 5, 6, 8. The Development of the Circular Bay, by Erosion of the softer Ma- 

 terial back of the harder Points of elevated Reef Rock. (5 and 8, Mata 

 Bay ; 6, Baracoa.) 



