Megaspherulites as large as 0.91 meter occur within rhyolite exposures on Steens Mountain, Oregon and ones as large as 1.83 meters in diameter occur within welded tuffs exposed near Klondyke, Arizona.
Steens Mountain, a fault-block mountain in southeast Oregon state
Several plant taxa are endemic to Steens Mountain, including Castilleja pilosa var. steenensis, Cirsium peckii, Draba cusickii var. cusickii, Penstemon davidsonii var. praeteritus, and Poa chambersii.
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Frenchglen is near Steens Mountain and Malheur National Wildlife Refuge, and is home to the historic Frenchglen Hotel.
Porter sold his small herd of cattle to French, and with the sale of his cattle went his squatter's rights to the west side of the Steens Mountain and his "P" brand.
McDermitt volcanic field, or Orevada rift volcanic field, Nevada/ Oregon, nearby are: McDermitt, Trout Creek Mountains, Bilk Creek Mountains, Steens Mountain, Jordan Meadow Mountain (6,816 ft), Long Ridge, Trout Creek, and Whitehorse Creek.