Geology (Mt. Lindsey)
Title: Mt. Lindsey Geology
Entered by: rockdoc53
Added: 10/19/2010, Last Updated: 10/19/2010
Sources: Johnson, B.R. and Bruce, R.M., 1991, Reconnaissance geologic map of parts of the Twin Peaks and Blanca Peak Quadrangles, Alamosa, Costilla, and Huerfano counties, Colorado: U.S. Geological Survey Miscellaneous Field Studies Map MF-2169
Blanca, Ellingwood,Little Bear and Mt. Lindsey are part of a granitic batholith formed over 1.7 billion years ago (Early Proterozoic). The top of Mt. Lindsey is the upper plate of a thrust composed predominantly of Early Proterozoic tonalite gneiss and metagabbro with a few Proterozoic mafic dikes intruding the tonalite gneiss. Metagabbro is a dark gray to very dark green, metamorphosed igneous rock of gabbroic composition, typically with phenocrysts of hornblende and plagioclase. Tonalite gneiss is a white to light gray green metamorphosed igneous rock of tonalite composition, typically 60% plagioclase, 30% quartz 2% potassium feldspar, and 8% percent mafic minerals altered to epidote, chlorite and muscovite. The lower plate, exposed on the north side of Lindsey is composed of Early Proterozoic hornblende gneiss.
Geology (Sangre de Cristo)
Title: Stratigraphy and Paleogeography of the Northern Sangre de Cristo 14ers
Entered by: shredthegnar10
Added: 05/10/2010, Last Updated: 05/10/2010
Sources: Bolyard, D.W., 1959, Pennsylvanian and Permian stratigraphy of the Sangre de Cristo Mountains between La Veta Pass and Westcliffe, Colorado: American Association of Petroleum Geologists Bulletin, v. 43, p. 1896-1939 Brill, K.G., 1952, Stratigraphy in the Permo-Pennsylvanian zeugogeosyncline of Colorado and northern New Mexico: Geological Society of America Bulletin, v. 63, p. 809-890 Hoy, R.G. and Ridgway, K.D., 2002, Syndepositional thrust-related deformation and sedimentation in an Ancestral Rocky Mountains basin, Central Colorado Trough, Colorado, USA: Geological Society of America Bulletin, v. 114, p.804-828 Lindsey, D.A., Clark, R.F., and Soulliere, S.J., 1986, Minturn and Sangre de Cristo formations of southern Colorado; a prograding fan delta and alluvial fan sequence shed from the Ancestral Rocky Mountains, American Association of Petroleum Geologists Memoir 41, p. 541-561
Crestone Peak, Crestone Needle, Kit Carson Peak, Challenger Peak, and Humboldt Peak all include rocks of the Pennsylvanian (323-299 million years ago) Minturn Formation and the Pennsylvanian-Permian (306-251 million years ago) Sangre de Cristo Formation.
The Sangre de Cristo Formation gradationally overlies the Minturn Formation (meaning that there is no missing time between them), and is defined by the redbeds near the basal part of the Sangre de Cristo Formation. The Minturn Formation consists largely of marine sediments (limestones, siltstones, shales), whereas the Sangre de Cristo Formation consists of primarily nonmarine sediments (arkosic conglomerates, sandstones, siltstones). The shift in the depositional environment resulting in these differences is interpreted as the result of a large-scale sea level regression that occurred during the Middle Pennsylvanian.
The Sangre de Cristo Formation consists of two members (members are kind of like subdivisions of a geologic formation): the Crestone Conglomerate and the Lower Member. The Crestone Conglomerate is defined by the presence of cobble(64-256mm diameter) and boulder (>256mm diameter) sized clasts.
Both the Sangre de Cristo Formation and the Minturn Formation formations were deposited in a sedimentary basin known as the Central Colorado Trough, which was created as a result of the uplift of the Ancestral Rocky Mountains, an indirect result of continental collisions involved in the formation of the supercontinent Pangea. Drainage systems developed to transport eroded material off of these mountains into the basin, and that material is what makes up these formations.
In the limestones of the Minturn Formation, scientists have identified numerous fossils, including fusulinids, brachiopods, crinoids, and bryozoans.
FUN FACT: The sediments of the Sangre de Cristo Formation were deposited during the same time period as the rocks of the Maroon Formation, which make up the Maroon Bells and Pyramid Peak.
Name History (Mt. Lindsey)
Title: Naming of Mt. Lindsey
Entered by: 14erFred
Added: 05/14/2010, Last Updated: 05/14/2010
Sources: Borneman, W.R., & Lampert, L.J. (1978). A climbing guide to Colorado's Fourteeners. Boulder, CO: Pruett Publishing Company. Eberhart, P., & Schmuck, P. (1970). The Fourteeners: Colorado's great mountains. Chicago: The Swallow Press. Hart, J.L.J. (1977). Fourteen thousand feet: A history of the naming and early ascents of the high Colorado peaks (Second Edition). Denver, CO: The Colorado Mountain Club.
The mountain was originally called "Old Baldy" because of the pronounced absence of trees on much of the peak. It rises from such a low altitude that about half of it lies below timberline -- a situation unique to Colorado Fourteeners. For years, it remained one of the least known of the Fourteeners until Malcolm Lindsey, for whom the mountain was eventually renamed, arrived on the scene.
Malcolm Lindsey was born in Pennsylvania in 1880, but grew up in Trinidad, Colorado, about 55 miles southeast of Old Baldy. Lindsey joined the Colorado Mountain Club (CMC) in 1922 and became the driving force behind junior activities in the Club. Over the next 20 years, he led many groups of teenagers to the summit of Old Baldy. He was President of the CMC from 1943-1946. He died on November 12, 1951. Old Baldy was Malcolm Lindsey's favorite mountain, and it is doubtful that any other person has climbed it as many times or has known it as well. He had a deep love for the mountain and considered it a special, sacred place.
In remembrance of Malcolm Lindsey's many years of service to the CMC, the Club's members submitted a proposal to the U.S. Board of Geographic Names to change the name of the peak from Old Baldy to "Mount Lindsey." On July 30, 1953, this name change was approved. Formal dedication ceremonies were held on July 4, 1954, with 64 climbers reaching the summit that day in commemoration of Malcolm Lindsey. In May 1955, a memorial marker was placed at the southern foot of the peak in a roadside park off State Highway 160, 3 miles east of Fort Garland. Unfortunately, this marker was stolen within the next month and was never recovered.