Ancient Web: Mount Diablo Became a 2003 Stereoscopic Geology Tour

Part of the Ancient Web Collection.

Before panoramic smartphone photographs, a geology enthusiast could make a rock formation feel dimensional by posting stereoscopic image pairs. An old Mount Diablo page preserves that approach with the efficiency of a field notebook.

Visit the Mount Diablo 3-D image tour.

The page is labeled San Francisco Bay Region 3D image tour and gives a last-modified date of November 24, 2003. It contains ten numbered images with short descriptions, linked to larger versions for closer examination. It is part of the broader educational GoNP geology resource hosted on a MiraCosta College server.

One mountain, several kinds of rock

The tour begins in Mount Diablo's Rock City area, where a photograph shows large weathered outcrops of Domengine Sandstone. Its accompanying note identifies this rock as Eocene in age, using a numerical date range from the site's period. Geologic timescale estimates have been refined since 2003, so the old numbers should not be mistaken for a current authoritative chart.

Subsequent entries describe massive sandstone boulders and the mountain's summit, listed as 3,849 feet. One photo looks northwest toward Eagle Peak, Mount Zion, and the distant Suisun Bay. Another points east along the crest of the Diablo Range, showing how the same summit links different stretches of the regional landscape.

Other photographs concentrate on geology rather than scenery. The page identifies serpentinite along the North Peak Trail, a walking route that follows a joint or fracture in sandstone, and a small cave among Rock City's weathered boulders.

Each picture has a filename—MtDiablo.jpg through MtDiablo10.jpg—and a caption. The page's deliberately minimal layout assumes visitors are here to open the photographs, compare them, and return to the index. There are no map tiles, autoplaying slideshows, user accounts, or modern trip-planning widgets.

This is not a substitute for current park access information or geological field safety guidance. It is a preserved educational view of a place in 2003, with attention to the rocks that make the landscape distinctive.

The archive's charm comes from being a complete little lesson. The photographs, directions of view, named formations, and short captions add up to more than a collection of vacation snapshots.

Browse the original 3-D photographs and geology captions.

Part of the Ancient Web Collection.