302:. The Dakota sedimented sandstone later came to be inundated by the waters of a shallow inland sea. From some 66 to 70 million years ago and episodically continuing for millions of years, uplift from the Laramide Orogeny exposed the old sandstone seabed, by tilting up to 90-degree angles the steep red megaliths now visible in the Garden of the Gods. Portions of the Dakota Formation again cycled into episodes of erosion, allowing a detritus of coarse-grained sedimentary sand to be displaced some three miles (5 km) eastwards, to land at the site which is now known as Austin Bluffs. The feldspar-rich sedimented particles of "arkose" sand consolidated into new sandstone, i.e. the Dawson Formation, which shows Eagle Rock's characteristic color, ranging from grey to reddish. At Eagle Rock, the sandstone cliff visible today has survived further erosion for a longer time, than the less-resistant background soils could have withstood. Eagle Rock lies exposed to view, as a weather-sculpted geological form.
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The Heller Center consists of a ranch house, guest house, and art gallery, surrounded by lilacs. Wild prairie, with some invasive vegetation like the classically pyramidal juniper tree, extends past the
Hellers' architectural landscape. Further southwards are sculpture gardens set onto the front
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U. S. Geological and
Geographical Survey of the Territories, F. V. Hayden in Charge (1877) "Panoramic Views – the Pikes Peak Group from Bluff East of Monument Creek" at the scale of 4 miles (6.4 km) to one-inch, in "Atlas of Colorado and Portions of Adjacent Territory." Washington D.C.
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From the 1930s Dottie and
Lawrence Heller homesteaded a 34-acre (140,000 m) land parcel in the pinion-pine grasslands at Austin Bluffs, settling directly below the rocky outcrop of Eagle Rock. The Hellers named their homestead "Yawn Valley", and held parties for Lawrence Heller's artist
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pink granite, which eventually degraded. Natural forces dispersed and deposited particles of the rock debris. Over time, the sediment collected and consolidated into new sandstone at the Garden of the Gods, producing a geologic layer known as the
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Eagle Rock participates in the Austin Bluffs area's soil type of the "Travessilla-Rock outcrop complex," as mapped at the scale of 1:24,000-ft., (ref. USDA, 1974.) The Eagle Rock cliff resulted from several long cycles of mountain-building
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After 60 years at Yawn Valley, the
Hellers bequeathed their ranchland with the architecture and art collection to the University of Colorado Colorado Springs for use as a nature preserve to support local arts and humanities education.
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U.S. Department of
Agriculture, Soil Conservation Service, in cooperation with the Colorado Agricultural Experiment Station, (surveyed 1974,) "Soil Survey of El Paso County Area, Colorado."
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lawns of an old art colony which appeared along
Stanton Road when the Eagle Rock suburban neighborhood was first developed. Since the university was established in 1965 at the former
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southern slope, campus development continues to edge around toward Eagle Rock's precincts. Far to the south, the skyscrapers of downtown
Colorado Springs are visible.
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field study classes are held at the Heller Ranch, where students practise birdsong-listening, wildflower identification, and dendro-chronological investigations.
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360:> Accessed 2007 Oct. 4. Note copyright which allows use for private scholarship and by university presses engaging in non-commercial publication.
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Huber, Thomas P. (1998) "Colorado: The Place of Nature, the Nature of Place" University Press of
Colorado, Niwat, Colorado. pp. 7 and 130.
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Huber, Thomas P. (1998) "Colorado: The Place of Nature, the Nature of Place" University Press of
Colorado, Niwat, Colorado. pp. 6 and 55.
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Electronic image from the collection of the Center of
Southwest Studies, Fort Lewis College, Durango, Colorado. Item. 1965:10003:A19. <
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