Grouse Hill – Prominent Geological Features of Crater Lake National Park
A short distance beyond the north rim of the caldera rises the steep-sided and wooded Grouse Hill. Diller supposed that the lava of Grouse Hill was older than the Llao Rock flow. There is, in fact, no way of deciding which of the two flows is the older. Probably they are of about the same age. Grouse Hill may be divided into two parts. At the south end there is a domical hill, approximately 3/4 mile in diameter. Here the flow planes are arranged in a crudely concentric manner about the summit. To the north lies a mesa, approximately 1/2 square mile in extent … [The Northern Arc of Vents: The Grouse Hill Dome and Flow, The Geology of Crater Lake National Park, Oregon (1942) by Howell Williams]
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