1 Febrero Vicinity of Arroyo Volcan…Locating our positions on the maps - geology, 1:250,000 topo, road map, Minch’s Baja Geology book. The GPS gives lat/long fix. Using a rule and pencil, J… marks it on the map. On the topo and geology maps contour lines given an approximate idea of how far up an arroyo we’ve come, what formation we encountered. It is not exact, because the maps are not exact. When J… takes a sample rock, he uses the GPS to fix the rock’s position and writes a general description of the location in the waterproof field notebook. Each sample is numbered subsequent to the previous one. The letters for this field project are BN (Baja Norte).
The sample and their associated witness rocks are not large; they fit in the palm of the hand.
2 Febrero…Picking which rocks to keep, which to discard, always heartwrenching. J… says the object of regional prospecting is to get someone interested in the rocks, in further exploration. Maybe ‘pretty’ rocks are good.
We stop so I can triangulate position on topo map. Three lines using Cerro Colorado, Pica Colorado and Cerro Tomas in order to intersect one point. Later the GPS positions us off the road so J… concludes that the road atlas is vague. The Mexican geology maps have few names on the arroyos and roads marked are limited to the main ones.
We acknowledge to each other the uniqueness of our mode of living - traveling and working across the land. The pace is our own. The land dictates where we go.
NEXT WEEK: The Art of Prospecting: A Long Walk Over Uneven Ground…Form