A Guide to the Geology of Catalina State Park and the Western Santa Catalina Mountains
Canyon Loop Trail
Romero Canyon Trail
Alamo Canyon Trail
Cañada del Oro
Santa Catalina Mountains
Catalina State Park
Wilderness Suite Granite
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CitationBezy, J.V., 2002, A Guide to the Geology of Catalina State Park and the Western Santa Catalina Mountains. Arizona Geological Survey Down-to-Earth Series DTE-12, 57 p.
DescriptionThe northwestern margin of the Santa Catalina Mountains, located within Catalina State Park and the adjacent Coronado National Forest, contains a variety of spectacular geologic features (Map A). Because of the relatively sparse desert vegetation, all of them are easy to recognize and photograph. Some of these features occur throughout much of the western United States. Others are unique to landscapes produced by the weathering and erosion of granite. This booklet is your field guide to the geology of this splendid desert landscape. It is a hiker’s guide; excursions on foot to the geologic features described in the text are encouraged. This book is written for the visitor who has an interest in geology, but may not have had formal training in the subject. It may also help ensure that the visiting geologist does not overlook some of the features described. To set the stage, I have briefly described the area’s geologic setting and geologic history. In the following pages, emphasis is given to descriptions of geologic features that are common in this landscape. Precise locations are provided for those features that have more limited distribution. Includes more than 30 images and illustrations and six maps.
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Effects of prescribed burning on breeding birds in a ponderosa pine forest, southeastern ArizonaHorton, Scott Patterson, 1951- (The University of Arizona., 1987)A moderately intense, broadcast, understory, prescribed burn in 3 previously unburned ponderosa pine stands in southeastern Arizona felled or consumed 50% of all ponderosa pine snags ≥ 15 cm dbh. Large moderately decayed snags were most susceptible to burning. Large snags in the early stages of decay were preferred as nest sites by cavity-nesting birds. Numbers of live woody plants were reduced by 40%, mortality was greatest among shrubs and small trees. Canopy volume was reduced by 19%, the greatest impact was below 5 m. No species of cavity-nesting birds, or birds that associated with understory vegetation disappeared in the first season after burning, but 3 species decreased, and 1 species increased in abundance. The minor impacts of a single treatment with broadcast understory burning on bird populations will be ephemeral, but a repeated burns could have greater, and more lasting effects on the avian community.