Colima was in a state of eruption as late as 1909, Jorullo (4262 ft.) is said to date from 1759, when its cone was formed, and Ceboruco (7100 ft.) in the territory of Tepic, shows occasional signs of activity.
Earthquake shocks are numerous, and Colima was in violent eruption in 1908-1909.
The Mexican and Interoceanic lines connect with Vera Cruz, the Mexican Central with Manzanillo, via Guadalajara and Colima, and the Vera Cruz & Pacific (from Cordoba) with the Tehuantepec line and the port of Salina Cruz.
Near the 10th parallel the great chain again divides, the eastern part crossing the southern end of the plateau, and the western, or Sierra Madre del Sur, following the shore line closely to Tehuantepec. The Sierra Madre Occidental has but few noteworthy elevations, its culminating points being the Nevado de Colima (14,363 ft.) and Volcan de Colima (12,750 ft.) in the state of Jalisco.
This part of Mexico is highly volcanic in character, the transverse ridge just described having a large number of extinct volcanoes and at least three (Colima, Jorullo and Ceboruco) that are either active or semi-active.