116 
15. Greenstone schist, hornblende rock of Lyell, peak of Guievixia. 
16. Grey-wacke schist; descent from Guichilona to Chihuitan. 
17. Grey-wacke from the hills of Barrio. 
18. Clay-slate, with the appearance of pearl-stone resting on the quartz in the 
summit of the Cerro de Espinosa. 
19. Clay-slate from the Portillo de Tarifa. 
20. Clay-slate found in the descent from the Portillo to the plains of the 
Venta. 
21. Clay-slate, also with the appearance of pearl-stone on the summit of Paso 
Partida. 
22. Clay-slate, in the gap between the above-named hill and that of Convento, 
on the road from Tarifa to San Miguel Chimalapa. 
23. Clay-slate on a hill on the road from Tarifa to the Cienaguilla. 
24. Greenstone schist found in the summit of Palo Blanco, mixed with frag¬ 
ments of quartz. 
25. Greenstone schist in the pass of the Chicapa, near the Rancho of Puerta 
Vieja, on the road from the Venta to San Miguel. 
26. Greenstone schist from the heights of the Upper Chicapa. 
27. Greenstone schist changing to dioritic from the ascent to San Miguel 
Chimalapa. 
28. Grey-wacke schist from the hills between the river Malatengo and the an¬ 
cient estate of Xochiapa, on the road to Boca de Monte. 
29. Talcose schist from the brow of the Sierra, in the ascent from Niltepec to 
the Cerro Atravesado. 
30. Clay-slate from the foot of the Sierra, half-way between Niltepec and Za- 
natepec. 
31. a and b clay-slate and talcose schist from the banks of the Upper Ostuta. 
32. Dolomite limestone found in a hillock at the foot of the hills of Laollaga. 
33. Compact limestone, with veins of calcareous spar, found near the slate in the 
neighbourhood of the Rancho del Zapotal. 
34. Compact limestone which breaks into thin sheets in the descent from the 
Portillo to the plains of the Venta. 
35. Calc tuff? from the same spot. 
36. Compact limestone, and occasionally stinkstone, with veins of pearl-spar, 
from the Convento Chico. 
37. Compact limestone of the Convento Grande : in one of the pieces there is a 
vein of calcareous spar, with fragments of diorite. 
38. Quartzose sandstone from Daniguiati. 
39. Argillaceous sandstone from Guievichi. 
40. Sandstone, partly quartzose and partly argillaceous, near the estate of 
Chi vela. 
41. Sandstone schist from the table-land of Tarifa; 
42. Sandslone from the foot of the small hill of Guievixia. 
43. Sandstone from the Piedra Parada of Daningadchi. 
44. Argillaceous sandstone from the foot of the Sierra, halfway between Nilte¬ 
pec and Zanatepec. 
45. Claystone which may change to jasper, on the road to Santa Maria Chima¬ 
lapa, between the river Escolapa and the Chocolate. 
