Paleozoic seas covered most of the northern Rocky Mountain region between the Cambrian and Cretaceous. Start at Fairy Lake or the M, depending on where you want to finish up, and get ready for heady views and stunning summits. Don’t let your eyes deceive you; it looks like a quick little jaunt over to the peak but is actually about 0.5 miles. Shown are rugose coral fossils preserved in a limestone outcrop. The openings in the wheat chex are fenestrae (windows) - the animals (zooids) don't live in those, but in tiny, pin-sized chambers in the solid part of the skeleton called zooecia. A Northwest Forest Pass is required to park at the trailheads. You have a few paths to pick from as you begin to plan your trip. This figure is from Lageson (1986), used with permission. From the saddle, descend to the east via the large scree … Show terms of use for text on this page », Show terms of use for media on this page ». On the lower western slopes, the rocks that are present are Proterozoic (~1.4 billion year old) conglomerates of the Lahood Formation of the Belt Supergroup north of Ross Pass, and in the south, the "basement rocks" are Archean (greater than 2.5 billion year old) metamorphiic gneisses. Reactivation of a Proterozoic Continental Margin, Bridger Range, Southwest Montana. Continue as Rouse Avenue curves east onto Bridger Canyon Drive, past the "M" trailhead, and continues up Bridger Canyon. The northern Bridgers as seen from the summit. Photo by Tyson Bernt. These mountains and high ridges form a unit separated from the rest of the Wallowas by river valleys, with the West Fork Wallowa River flows north along the east edge and Hurricane Creek along the west. A rock glacier in upper Corbley Canyon, on the west slope of the Bridger Mountains. It also is possible to come directly from Ice Lake across a saddle in the Hurwal Divide and up lots of red scree on the southeast side.The Wallowa Range is very different from anywhere else in Oregon. Aconcagua mountain page is a child of the 'Aconcagua Group' and the 'Seven Summits.' These shallow seas deposited thick sequences of sediments as the ancient sea level rose and fell. Tabulate coral in late Paleozoic (Mississippian) limestone outcrop. This is a steep but safe scree slope harboring numerous mountain goat wallows. Deformation didn't end in the Cretaceous! As you approach the saddle on the ridge, you will encounter entirely different fossilized life forms in the Devonian and Cambrian rocks that are exposed there. A large cairn marks the point where three trail intersect. Sacajawea Peak is closer to Hurricane Creek, and several tributary streams rise on the slopes of Sacajawea, such as Thorp Creek. Gallatin National Forest Avalanche Center, Montana-Yellowstone Geologic Field Guide Database, http://creativecommons.org/licenses/by-nc-sa/3.0/, http://pubs.usgs.gov/of/2004/1216/glaciertypes/images/glacierrock1.gif. Back to TopThe hike from Fairy Lake Campground to Sacagawea Peak is a short hike (~2 miles) of moderate grade which takes you through hundreds of millions of years of geologic time. There are many layers of fossils preserved in the limestones on this stretch of trail--"horn" (rugose) corals, "brain" corals, numerous varieties of shelled organisms called brachiopods, byozoans (with branching and encrustation forms), and crinoids (also known as "lilies of the sea'). For a more detailed look at the geologic evolution of the Bridger Range see "Reactivation of a Proterozoic Continental Margin, Bridger Range, Southwestern Montana" (Lageson, 1989). Upper basin on the Sacagawea Trail, showing the cirque headwall on the skyline, and a pro-talus rampart in the foreground. Sacajawea Peak (or just “Sac”), towering at 9650 ft., is the tallest peak in the Bridger Range and provides some of the most easily-accessible, high-elevation views in the area. The Bridger Range was formed by at least 5 major mountain-forming events, which caused the uplift of the range, and these structures are evident in the rocks exposed at the surface today. Sacagawea Peak is fairly accessible from Bozeman and—because the trailhead is already at 7,788 feet—it makes for a great, easier, summit-bagging experience. Public campground at Wallowa Lake Campground.Free camping at Ice Lake and anywhere in the wilderness as long as you are off trail and away from water. Not for the timid, or average skier. As you go downhill to the west, you'll pass through the lower Paleozoic--through the Pilgrim Limestone, Park Shale, Meagher Limestone, Wolsey Shale, and Flathead Sandstone of Cambrian age, and you will eventually cross the contact with the Proterozoic Lahood Formation which consists of coarse conglomerates made of cobbles of Archean metamorphic rocks. http://www.opb.org/news/article/settled-at-last-sacajawea-tallest/, "USA Lower 48 Top 100 Peaks by Prominence", "Oregon Peaks with 2000 feet of Prominence", The 126 most prominent summits of the United States of America, The 107 most isolated major summits of greater North America, https://en.wikipedia.org/w/index.php?title=Sacajawea_Peak&oldid=983549939, Creative Commons Attribution-ShareAlike License, This page was last edited on 14 October 2020, at 21:28. But before you start thinking there's finally a place with solid rock, think again. [7], Sacajawea Peak is named for Sacagawea, the Shoshone woman who traveled with the Lewis and Clark Expedition. Photo by Travis Corthouts. Photo by Travis Corthouts. See also this route for directions to the Wallowa Lake Trailhead. South of the Sacajawea and Matterhorn high lands is Lake Basin, in which the Lostine River, West Fork Wallowa River, and Hurricane Creek originate among many small lakes. Sacagawea Peak is the tallest peak in the Bridger Range of Montana. Starting in the Cretaceous (and continuing through the Eocene), there was a regional contractional event that resulted in the thin-skinned (relatively shallow) fold-and-thrust belt style of deformation (also known as Sevier-style). Photo by Travis Corthouts. Sacajawea Peak is a peak in the Wallowa Mountains, in the U.S. state of Oregon. Both are connected to Hurwal Divide, a high ridge extending east and north from Sacajawea and Matterhorn. Photo by Travis Corthouts. Photo by Travis Corthouts. So I started driving north out of town and noticed the headlights in my car dimming considerably. Skipp, B., Lageson, D.R., McMannis, W.J. [5], The nearest peak higher than Sacajawea is Pinyon Peak, in the Rocky Mountains of Idaho, 126 mi (203 km) to the east. For many months I’d been trying to reach Sacajawea Peak. Overview. Material on this page is offered under a If you want to see the Gallatin Valley spread beneath you while you hike, you could also choose to come from the west, taking Corby Creek Trail or North Cottonwood Creek Trail up the east-facing side of the range. Sacajawea Peak (or just “Sac”), towering at 9650 ft., is the tallest peak in the Bridger Range and provides some of the most easily-accessible, high-elevation views in the area. (This is also the start of the famous Bridger Ridge Run). Photo by Travis Corthouts. Sacajawea's east face is a massive slab of layered marble from the Martin Bridge Formation. To get to this popular trailhead, head out of Bozeman toward Bridger Bowl, and keep driving just beyond to the turnoff. © 2006-2020 SummitPost.org. Hiking info, trail maps, and 10 trip reports from Sacajawea Peak (9,838 ft) in the Wallowa Mountains of Oregon Diagram of non-fossilized brachiopods. That's where staying in Bozeman comes in handy, since you're not far from the trailhead, but you can still grab all the essentials before you head up.

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