By Ronald L. Ives
Fig. 1. Summary map of central North America, showing length of Serra march compared to more familiar distances.
Fig. 2. Climatic maps of western North America, showing classification of Baja California climate by three of the better-knoewn systems. BWh, BWk, Eb’d all indicate “desert.”
Fig. 3. Climatic charts for selected stations from Los Angeles southward.
Fig. 4. Rainfall profiles, seasonal distribution, and terrain profiles for Baja California.
Fig. 5. Aridity of the Sonoran Desert Region, as computed by DeMartonne’s Formula. A small value of the aridity index indicates great aridity.
Page 27. Fig. 6.
Generalized east-west cross section of Baja California, summarizing major geologic, tectonic, and erosional components.
Fig. 7. Cross section showing characteristics of man and mule trails.
Fig. 8. Areneno foot trail at Pinacate, Sonora. So far as can be determined, this trail has never been travelled by a shod animal.
Fig. 9. Characteristics of mule trails.
Fig. 10. General route of the Serra trail from Loreto to Santa Gertrudis.
Fig 11. Ancient trails northward from Santa Gertrudis to San Juan de Dios.
Fig. 12. Serra route from San Juan de Dios to San Diego.