The Journal of San Diego History
Fall 1975, Volume 21, Number 4
James E. Moss, Editor
Thomas L. Scharf, Assistant Editor

By Ronald L. Ives

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Serra march

Page 21.


Page 22.
Fig. 1. Summary map of central North America, showing length of Serra march compared to more familiar distances.

Climatic maps

Page 23.
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.”

Climatic charts

Page 23.
Fig. 3. Climatic charts for selected stations from Los Angeles southward.

Profiles for Baja California

Page 24.
Fig. 4. Rainfall profiles, seasonal distribution, and terrain profiles for Baja California.

Aridity of the Sonoran Desert Region

Page 26.
Fig. 5. Aridity of the Sonoran Desert Region, as computed by DeMartonne’s Formula. A small value of the aridity index indicates great aridity.

Baja California

Page 27. Fig. 6.
Generalized east-west cross section of Baja California, summarizing major geologic, tectonic, and erosional components.

Ccharacteristics of man and mule trails

Page 27.
Fig. 7. Cross section showing characteristics of man and mule trails.

Areneno foot trail at Pinacate, Sonora

Page 29.
Fig. 8. Areneno foot trail at Pinacate, Sonora. So far as can be determined, this trail has never been travelled by a shod animal.

Characteristics of mule trails

Page 30.
Fig. 9. Characteristics of mule trails.

Serra trail

Page 32.
Fig. 10. General route of the Serra trail from Loreto to Santa Gertrudis.

Ancient trails

Page 33.
Fig 11. Ancient trails northward from Santa Gertrudis to San Juan de Dios.

Serra route

Page 35.
Fig. 12. Serra route from San Juan de Dios to San Diego.