A new collection has recently been made available on DIVA! The Earth - A Work in Progress collection, created by SFSU geology professor Raymond Pestrong, includes a diverse array of photo collections documenting local, national, and international sites of geological interest. Many of the collections contain images of extraordinary geological features, like this Hoodoo formation in the Negev, Devil's Postpile near Mammoth Lakes, sandstone domes in Jordan, and Half Dome in Yosemite. The photos, taken throughout the 1960s-1980s, additionally allow for a comparison to the modern state of many unique sites. For example, take a look at this tidewater glacier in Alaska that already shows signs of glacial retreat, or shrinking. Some of the collections also demonstrate how different processes affect and create geological features, as seen in this photo of weathering pits in Yosemite. Earth - A Work in Progress contains six sub-collections for your enjoyment, including the San Francisco Tidelands Collection of photos from local SF Bay Area sites.
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