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Geology Map of Mount Diablo Geologic Map Legend Quarternary - surficial deposits Quarternary - landslide deposits Jurassic/Cretaceous - dark greenish-gray shale sandstone interbeds (Knoxville Formation) Miocene/Pliocene - non-marine sandstone, siltstone, and conglomerate Miocene - marine fossiliferous sandstone and shale Jurassic/Cretaceous - melange (Franciscian Complex) Jurassic - chert and basalt with some graywacke and shale (Franciscan Complex) Miocene - silicic intrusive rocks Jurassic - basalt and diabase (Coast Range Ophiolite) Eocene - massive pebbly sandstone with shale Jurassic - serpentinite (Coast Range Ophiolite) Cretaceous - shale, siltstone, and sandstone (Great Valley Sequence) Silica carbonate rock (altered serpentinite) Thrust Fault Thrust Fault - inferred Fault Fault - Inferred Roads Streams Data Source Preliminary Geologic Map Emphazing Bedrock Formations in Contra Costa County, California. Compiled by R.W. Graymer, D.L. Jones, and E.E. Brabb U.S. Geological Survey Open-File Report 94-622 Arc/Info Data Files Simplified with minor modifications by Roi Peers and Craig Lyon, September 1996. Geologic Information Systems Map by Eric R. Sheehan, Martinez, California.

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3 cups Blueberries 3 cups Flour 1½ cups Butter Mount Diablo State Park offers an extensive network of trails and fire roads--some are ideal for easy, scenic rides, while others are more challenging, testing both the horse and the rider for endurance and ability to navigate rough terrain. The Mount Diablo Guide , 3rd Edition Horseback Riding on Mount Diablo Most state park trails are equipped with unlocked gates allowing access across fence lines. Ask rangers for current information. Note to Equestrians The Mary Bowerman Trail and the Summit Trail above lower summit parking lot. The following trails are closed to horses: Two large staging areas for equestrian use: Mitchell Canyon staging area is located on the north side of the mountain near Clayton, and the Macedo Ranch area is located on the west side of the park in Alamo. Most other trailheads are suitable for unloading horses with the exception of those trailheads with only limited parking along road shoulders. Water Troughs Water troughs can be found throughout the park. However, these are not maintained and may be empty. Be prepared and carry water for you and your animal. Horses have the right-of-way on trails Hikers are expected to step to the side of the trail and avoid sudden movement that might frighten the animals. Horse Camping The park has one approved horse camp, BBQ Terrace. It will hold up to 50 horses and 50 people. Reservations can be made through the regular camping reservation system: ReserveCalifornia Equestrian Links California State Horsemen's Association, region 5

See map, below TRAILHEAD KEY DIFFICULTY DISTANCE 4 Easy/Peasy <1 mile Mary Bowerman Trail 5 RATING: Easy TRAILHEAD: Access on north side of road beside small picnic site where Summit Road splits into two one-way routes just past exit to Lower Summit Parking Lot. Drinking water and toilets at lower summit parking lot. Less than a one mile flat loop trail encircling TRAIL STATISTICS: the summit of the mountain. Allow half hour without stops. The first one third is paved and is ADA accessible up to the Ransome Point overlook. DESCRIPTION: This easy trail offers spectacular views as well as a journey through time. Discover how nature has created and altered this peak. There are 14 stops, following the Mary Bowerman Trail Guide (PDF) which can be obtained at the Summit Visitor Center or picked up at the trailhead. This will guide you through the diverse flora, fauna, geology and weather which embraces Mt. Diablo's summit. You will be introduced to chamise, yerba santa, California native juniper, scrub oak and poison oak. Being careful not to step on the sagebrush lizard as you skirt the summit, you'll come across Devil's Pulpit, a great red-colored monolith, made of chert. Greenstone, an altered submarine volcanic rock laid down on the ocean floor, over 100 million years ago, is the most common rock exposed on the summit of the mountain. Banded red chert, blocky greywacke sandstone and patches of shale are also present along the route.

3 cups Blueberries 3 cups Flour 1½ cups Butter The Mount Diablo Observatory Association (MDOA) is dedicated to public education in astronomy. The organization includes scientists, engineers, and other professionals with a common interest in astronomy and a desire to further science education. MAILING ADDRESS: Mt. Diablo Observatory Association, Inc. P.O. Box 3165 Walnut Creek, CA 94598-3165 In celebration of the International Year of Astronomy 2009, NASA Great Observatories -- Hubble Space Telescope, Spitzer Space Telescope, and Chandra X-ray Observatory -- have produced a matched trio of images of the central region of our Milky Way. Stargazing on Mount Diablo Mount Diablo Astronomical Society (MDAS) Event Calendar The Mount Diablo Observatory Association, Inc. (MDOA) is a cooperating organization within Mount Diablo State Park. Incorporated in 1988, MDOA members planned, raised funds and established an astronomical observatory. The observatory consists of a Solar powered 96 square foot roll-off roof observatory, and a 500 square foot warming room. The heart of the observatory is a computer controlled Celestron 14, which has a variety of electronic attachments, a CCD camera, and photographic equipment. The addition of a refractor to the observatory has enhanced the photographic tasks and the public outreach of the observatory. A 15 Kilowatt generator provides all the electrical needs for lighting, heating, and AC for the comfort of our visitors in the warming room. At nearly 3800 feet above the mean sea level, the observatory has an unobstructed view of the night sky (and Mount Diablo is the highest mountain within the San Francisco Bay Area with a public access observatory). Every year MDOA and its sister organization, Mount Diablo Astronomical Society, operate Public Astronomy Programs under the sponsorship of Mount Diablo State Park. This program is now in its 28th year! For written information, applications for Associate Membership ($30/year; $25 annual membership + $5 MDAS name badge) to support the observatory or for other correspondence feel free to contact us by email, or in writing at: Mount Diablo Astronomical Society P.O. Box 4889 Walnut Creek, CA 94596 Celestron 14 | Jon Wilson Planetary Nebula, M 57 in Lyra. June 12, 2010 Information for Visitors: EXCITEMENT FOR THE WHOLE FAMILY! MOON Photographed April 13, 2009 Participate in hands-on astronomy activities followed by supervised observing through the many different telescopes of MDAS members. Bring snacks, water, binoculars, and warm clothes. If you bring a flashlight please cover it with red material. Please note that only Mount Diablo Astronomy Docents may set up telescopes on Public Nights. LOCATION DETAIL Mount Diablo, at the Lower Summit Parking Lot off Summit Road, almost to the top of Mount Diablo Summit Rd, Walnut Creek, CA 94598 More information at: Mount Diablo Astronomical Society Another astronomy link: Western Amateur Astronomers The material above is provided by Mount Diablo Observatory Association and Mount Diablo Astronomical Society

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