These are little hiking cards used for a field trip to Claremont Canyon Regional Preserve in the Berkeley/Oakland hills. Each group consisted of four students, assigned to a card A-D to read out to their group at different intervals.
I recommend printing cards four to a page on card stock. I opted to double-side and laminate for reuse, too!
NGSS Connection: 2-ESS2-1 and 2-ESS2-2
More info about Claremont Canyon: http://www.ebparks.org/parks/claremont_canyon