Cores taken at cactus and then grass at about 1445 today (29 Nov). I brought them back to Boulder and did the first weighing at about 1715, so hopefully they hadn't dried too much. Both samples did not completely fill up the corer (despite being pounded in all the way on the outside). Thus I would estimate that the first core is 0-2.5cm and the second from 2.5-5.5cm. I'll update this tomorrow with the numbers.