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Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
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Transcription
Pearson-1990
3
Hence, viscachas don't make the amber?
Then hiked up to the cliffs above our campsite, where shallow
caves were visible. But no droppings, no broken rock.
The vegetation on the way up is strictly like Cerro Leones or like the hike
up to the cave at Estacion Perito Moreno
November 3- La Primavera. Sprinkles off and on overnight. At dawn snow mixed
with drizzle, wind. It is about 2 km from the road back to the cave at the
end of the moraine. Lots of hare tracks in the flat pasture, especially in
the open sandy part. Ponderosa pine seedlings surviving there in what
seems an impossible arid windy area. Nothing in my trap line in the cave.
No sign of fresh droppings or fresh cuttings. Anita's 24 Shermans and 2
steel traps set mostly in Colletia (espina negra) along the moraine caught
2 adult Oryzomys and 5 adult Abrothrix. There was considerable new snow on
the surrounding hills, none on the grond here although a little collected
on the tent.
Collected droppings and amber in the cave, and plants from
nearby to use for comparison with contents of fecal pellets. The
nearest cipres is about 25 m away but dead. The next closest is
about 50 m. Nearest vegetation is calafate (Berberis), Ephedra,
espina negra, neneo, radal, Senecio, Mayten, Acaena, bunchgrass,
willows on the river.
The cave is considerably below the level of the the bunchgrass pasture
and much lower than the top of the terminal moraine, so it would have been
uninhabitable at the time of the earliest glaciation in the valley.
Weather cleared briefly at mid-day, so we drove down to
Confluencia and photoed two ancient-photo scenes, But then it
started to snow again and snowed heavily at times.
Our campsite on the creek has numerous small Gunnera plants
in it. Also one small nire (Nothofagus antarctica) with llao llao growing
on it. This is the only nire I know of near here.
November 4- La Primavera. Cleared partially during the night, full moon.
Minimum temperature 31 F., light frost, not as windy. Picked up my traps
at the cave; none of them touched. Then collected various scats, bones,
plants etc. in the cave. Numerous deposits containing short half-inch
lengths of plant stem that must be either nesting material or mid-ribs or
something left over after eating. Anita found a dried tail about right
size for Phyllotis, and numerous small bones and jaws. The jaws seem to be
Abrothrix, Auliscomys, Buneomys, and Reithrodon. Add to this two giant tuco
tucos found by Michael Christie and me last year. Anita is sorting
droppings and finds sizes ranging from viscacha (Lagidium), rat, Buneomys,
and smaller mouse.
Then broke camp and drove up to the Casco and visited with the
Administrator Lorenzo Sympson, his wife Graciella, and young son Guillermo.