Mary Bowerman Tour

Featuring naturalist Ken Lavin, this guided hike focuses on the geology and history of California’s 3,849-foot Mount Diablo. The tour can be enjoyed at home, or--better yet--downloaded to an audio player or smartphone to take on the trail. It’s an exciting new way to explore and learn about the wonders of nature. Sponsored by the Mount Diablo Interpretive Association, 2009. Music by Phil Heywood.

What you need to know before you go.
Music: “Wind River Ramble,” Circle Tour, by Phil Heywood. Photos: Devil’s Pulpit, map (by Patrick Hamilton), optional equipment, MP3 player, sign, trailhead.  
The Big Geological Picture
Music: “Circle Tour,” Circle Tour, by Phil Heywood. Photos: Diablo from Morgan Territory, Ken Lavin, Diablo in fog from Walnut Creek, chert (“Old Rock on Top”), Andrew Lawson (courtesy Judith Coyote, Earth and Planetary Science Department, University of California at Berkeley), pillow basalt, chert, greywacke sandstone, fog from Juniper Camp (“North American Plate”), Golden Gate from Indian Rock, How Plates Move ( art by Patrick Hamilton), Marker 3.
What made the rocks?
Music: “Manna From Kokomo,” Circle Tour, by Phil Heywood. Photos: pillow basalt by marker 3, pillow basalt behind marker 6, greywacke sandstone, lichen, next stop.
What made the rocks? (continued)
Music: “Movin’ With the Moon,” You Got to Move, by Phil Heywood. Photos: radiolarian chert, radiolarians (Randolph Femmer/life.nbii.gov), green chert, black chert, subduction model (Oreo-type cookie), next stop.
Get your bearings.
Music: “Old River Man/One Funky Dime,” You Got to Move, by Phil Heywood. Photos: overlook, Roundtop Peak, Mount Zion, vulture (by Joe Oliver), David Douglas, poison oak, gray pine, gray pine cone, Mount Diablo fairy lantern, next stop (telescope).
The seas around us. 
Music: “Fred Meets Joni,” You Got to Move, by Phil Heywood.  Photos: telescope, North Peak, Sacramento–San Joaquin River Delta, Great Valley Sequence, Geologic Eras (art by Patrick Hamilton), Domengine Sandstone, gomphotherium (art by Carl Buell), John Marsh portrait (courtesy John Marsh Historic Trust), Rancho Los Meganos (courtesy John Marsh Historic Trust), Devil’s Pulpit.
What made the mountain? 
Music: “Medley: Spirituals in C,” You Got to Move, by Phil Heywood. Photos: Devil’s Pulpit (trail to), Devil’s Pulpit (view from), thrust fault art (Patrick Hamilton).   
Slickensides.
Music: “Dulcimer Medley,” You Got to Move, by Phil Heywood. Pictures: the rock ahead, slickenside, John C. Fremont portrait, Mount Diablo State Park Visitor Center.
Big fossils.
Music: “Circle Tour,” Circle Tour, by Phil Heywood. Photos: bronze sign, pillars, fossils in rock, Mount Diablo State Park Visitor Center, 15-million-year-old rock, sand dollars, scallop, Devil’s Pulpit.
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