Extension to Biscuit Basin Yellowstone

NOTE: This extension can also be approached from the other end by parking at Biscuit Basin (see 68). To head back to Old Faithful, skip to 96 for the features you’ll see. See the map on 83. The unpaved trail from Morning Glory Pool to Biscuit Basin takes you about 0.8 mile (1.3 km) over a hill to several splendid springs and geysers. Since few people explore beyond Morning Glory, it’s a great place to escape the crowds and see some Yellowstone treasures. The following description identifies the unmarked thermal features on this trail for you. Be sure to stay on the trail! Three or four small geysers line the riverbanks just beyond Morning Glory Pool, most notably East Sentinel Geyser, whose cone makes an island near the east side of the Firehole River when the water is high. About 0.4 mile (0.6 km) from the Morning Glory area are two geysers below the rock wall that supported the old road. Artemisia Geyser takes its name from the scientific name for sagebrush (Artemisia tridentata), which shares its gray-green color with some of the gey-serite deposits under the water at the turquoise blue pool’s edge.

Its eruptions surge as much as 30 feet (9 m) with very little warning, at intervals ranging from 9 to 34 hours. Uphill from Artemisia are two milky bubblers, one with a beautiful mossy overhang and rust-stained edge. Atomizer Geyser (also called Restless Geyser) consists of the two small cones between Artemisia and the slope down to the river. It’s named for the device that breaks a liquid down into a fine spray. Atomizer’s spraying, from the cone farthest from the river, takes place only during major eruptions. Such eruptions, which may go to 50 feet (15 m) high and last 10 minutes, occur about twice a day. More small geysers line both sides of the river near here, but they are dicult to see through the trees. One of these was so directly a creation of the 1959 Hebgen Lake earthquake that it’s called Seismic Geyser. It erupted as high as 75 feet (23 m) during the following 15 years. In 1999 and 2000, a new and unnamed vent close to Seismic erupted frequently as high as 20 feet (6 m) and sometimes much higher. Geyser gazers call it Aftershock Geyser.

Extension to Biscuit Basin Yellowstone Photo Gallery

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