Rasac
(possibly
Quechua for toad)
is a
mountain in the
Huayhuash
Huayhuash (possibly from Quechua ''waywash'', weasel'','' or ''waywashi'', squirrel) is a mountain range within the Andes of Peru, in the boundaries of the regions of Ancash, Lima and Huánuco.escale.minedu.gob.pe - UGEL map of the Cajatambo Pro ...
mountain range in west central
Peru, part of the
Andes.
It has a summit elevation of ,
although other sources cite a height of .
Rasac is a long, relatively squat mountain on the western edge of the Huayhuash range, across the glacier from the tallest peak in the range,
Yerupajá. Although it is a 6,000 metre mountain, Rasac's broad profile is dwarfed by Yerupajá.
Geology
As the rest of the Huayhuash, Rasac is made mainly of
limestone, interbedded with
sandstone and
shale
Shale is a fine-grained, clastic sedimentary rock formed from mud that is a mix of flakes of clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2 Si2 O5( OH)4) and tiny fragments (silt-sized particles) of other minerals, especial ...
. These sediments were originally laid down on the ocean floor and have been pushed up and folded due to the convergence started about 90 million years ago when the Nazca oceanic plate started to slide under the South American continental plate. The limestone has a coarse, sharp texture and is light to dark grey in colour (although sometimes a slight bluish tint can occur). Marine fossils (
bivalves
Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bival ...
and
ammonites) may be found within some of the limestone beds. Some volcanic activity has also influenced the geology of the Huayhuash.
Climbing
Rasac is considered to be the easiest 6,000-metre peak in the Huayhuash range, but it is still a challenging climb. The long, snowy West Face is divided by a series of buttresses, most of which have routes in the D range according to the
International French Adjectival System
In rock climbing, mountaineering, and other climbing disciplines, climbers give a grade to a climbing route or boulder problem, intended to describe concisely the difficulty and danger of climbing it. Different types of climbing (such as sport ...
.
The Right Buttress is still unclimbed. The East Face is almost all rock, most of which seems in the condition not to be climbed. There is allegedly a snow route of moderate difficulty (considered to be the normal route and rated around AD) up a gulley on this face that looked in the summer of 2007 to be totally out of condition.
Even if Rasac is overall the most climbed peak of the Huayhuash range, it remains a mountain climbed very rarely (less than a climb per year). The mountain lies in a remote and wild setting. Expeditions willing to climb in this area have to be fully self-sufficient in case of an accident or emergency.
A traverse of the mountain begins with five pitches of rock up the east face to gain the south ridge, a long airy corniced snow and ice ridge to the summit followed by descending the north ridge and down NE face of mixed snow, rock and ice. V 5.8 AI 3–4 James Garrett, Paul Gonzales spring of 1996.
External links
Rasac on Summitpost
References
{{reflist
Mountains of Peru
Mountains of Ancash Region
Mountains of Lima Region