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Scientific Investigations Map 2899 U.S. Department of the Interior Sheet 2 of 3 U.S. Geological Survey Pamphlet and CD-ROM accompany map

GLACIAL, SEDIMENTARY AND HYDROTHERMAL DEPOSITS VOLCANIC CENTERS OF SOUTHERNMOST CASCADES

1917 C.E. p17 Phreatic deposit, May–June w2 Viscous debris-flow deposits, May 22 p2 -fall deposit, May 22

pw2 Pyroclastic-flow and associated fluid debris-flow deposits, May 22 Deposits of 1914–1917 eruption of 1915 C.E. d9 flow, May 19–20 f9 Flood deposits, May 19–20 sw9 Avalanche and debris-flow deposits, May 19–20 p9 Pyroclastic deposit, May 19 CORRELATION OF MAP UNITS HEADNOTE d4 Dacite dome, May 14–19 [See Description of Map Units (pamphlet) for detailed unit descriptions and interpretation of unit ages; ages shown may be averages of several ages. See table 2 and references in unit descriptions for age analysis information. Fantastic mf2 Flow 2 Units of volcanic centers and the Caribou are shown on colored backgrounds for emphasis. Sequences are groups of volcanoes related by lithology and age. Chains are sequences displaying conspicuous linear Beds mf1 Flow 1 geometry. Indentations in left margin of Lassen Volcanic Center area indicate intercalations with glacial and surficial units. Age boundaries based on Gradstein and others (2005) and Walker and others, 2009. Paleomagnetic Basaltic of 1666 C.E. mp2 Flow 2 polarity (+, normal; -, reversed) boundaries based on Berggren and others (1995). C.E., Common Era. Unit age is left of unit box; unit name is right of unit box. Some unit boxes represent groups of units, such as the unit box Qsh Landslide h Hydro- ht Travertine Painted mp1 Flow 1 labeled bb, which is not a unit on the map. A note in parentheses to the right of the unit name shows that the box represents units bb1–bb6 and bb8–bb12. Colored arrows pointing up and down from unit boxes indicate the deposits in thermally Dunes mo Old Bench flow possible range in age of unit. See table 3 for alphabetical listing of map unit labels, as well as unit name, page number of unit description in pamphlet, unit age, location by heading in Correlation of Map Units, and quadrangle hydrothermally altered rocks 278±28 yr B.P. Qsj Avalanche deposits of Chaos Jumbles location in database] altered core of in active HOLOCENE Brokeoff thermal areas rcf Talus, emplaced pce Lithic pyroclastic-flow deposit from REGIONAL VOLCANIC ROCKS hot from rce partial collapse of dome E domes B–F pcd Lithic pyroclastic-flow deposit from Qf Alluvium Qc Colluvium cc Domes partial collapse of dome D and talus A–F rcd of rcc NORTH AND WEST OF LASSEN VOLCANIC CENTER SOUTH AND EAST OF LASSEN VOLCANIC CENTER REGIONAL VOLCANIC ROCKS OF THE CARIBOU AREA Qd Diatomite rcb

rca 1,103±13 yr B.P. pc Pumiceous pyroclastic-flow Late Pleistocene volcanic rocks 3,310±55 yr B.P. and fall deposits ~8,000 yr B.P. Qwh Debris-flow deposits from the northeast side of Lassen Peak Qth Till or protalus-rampart debris ? 11.7 Qtal Late till of ka* Anklin Meadows a74 of hill 7416 atd Andesite of Devils Rock Garden Qta Till of Anklin Meadows Qoa Outwash gravel of Anklin Meadows Twin Lakes sequence, younger Twin Qcl Talus on Lassen Peak Qtrl Post-maximum till of Raker Peak consisting of Lassen Peak avalanche debris Eagle Peak sequence mtt Qty Till, younger Qoy Outwash Qou Outwash Qsl Avalanche debris from Lassen Peak spread across glacial ice of Turnaround Lake glaciations gravel, gravel, 24±6 ka bhc Hat Creek mrc Basaltic andesite of Red Cinder Cone Lithic pyroclastic-flow deposit younger undivided 27±1 ka pfl (tholeiitic) glaciations from partial collapse of dome Dacite of Lassen Peak dl Tumble brc Dome adb Andesite of Bidwell Spring Basalt of Red Cinder Cone Buttes Qtr Till of Raker Peak Qor Outwash gravel of Raker Peak chain 35.1±3.1 ka atb Andesite of Bear Wallow Butte mrr Basaltic andesite of Red Cinder mdp Basaltic andesite of Pole Spring Road rk Flows mt67 Basaltic andesite of hill 6770 Rhyodacite of Kings Creek 35±1 ka pk Pumiceous pyroclastic-flow deposits mt54 Basaltic andesite of hill 5410 Bidwell br80 Basalt of hill 8030 mtu Basaltic andesite md36 Basaltic andesite of section 36 rsf Domes of Tumble Buttes Spring Rhyodacite of Sunflower Flat chain brm Basalt of Cameron Meadow 41±1 ka psf Pumiceous pyroclastic-flow deposits mtb Basaltic andesite of Bear Wallow Butte Red Tuya 43±2 ka rkr Rhyodacite of Krummholz ah Andesite of Hat Mountain mt61 Basaltic andesite of hill 6138 bra Basalt of Ash Butte 46±7 ka ass Andesite of Sugarloaf Peak 46.3±3.4 ka bdt Basalt of Twin Buttes Cinder chains mt5 Basaltic andesite of section 5 chain ? ? mdb Basaltic andesites of (Units 1–2) br22 Basalt of hill 2283 att Andesite of Tumble Buttes r27 Rhyodacite of section 27 mte Basaltic andesites mtm Basaltic andesite of Mud Lake ae Andesite of Eagle Peak br25 Basalt of section 25 ? of Evelyn Lake bk Tholeiitic of 65±45 ka bbz Tholeiitic basalts of Big Lake (units 1–2) Sugarloaf 66±4 ka re 67±4 ka msl Basaltic andesite of Buzzard Springs Dome and flow chain 69±20 ka arr Andesite of Red Cinder Rhyodacite of Eagle Peak Lassen domefield Little Potato Butte bic Tholeiitic basalt of pe Pumiceous pyroclastic-flow deposits Ice Cave Mountain bre Basalt east of Ash Butte PLEISTOCENE LATE 77±11 ka asp mrd Basaltic andesite and andesite Andesite of Potato Butte meh Basaltic andesite brw Basalt of Widow Lake 82±14 ka mfp Basaltic andesite of Fairfield Peak of Red Lake Mountain ms47 Basaltic andesite of hill 4709 of Eskimo Hill mrg Basaltic andesites of Long Lake (Units 1–3) 93±13 ka ac Qtb Andesite of Crater Butte aso Andesites of Old Station 97.6±9.8 ka bc Basalts of Cone Lake Road (Units 1–2) Till of Badger Mountain mrm Basaltic andesite of Red Mountain mrb Basaltic andesite of Caribou Wilderness bcc Basalts of Cold 102.1±11.4 ka bg Basalts of old railroad grade (Units 1–4) brt Basalts of Triangle Lake (Units 1–2) Creek Butte 105.0±6.0 ka bp Basalts of Poison Butte (Units 1–6) ? mte Basaltic andesites 107.5±3.8 ka Basalts and basaltic andesites bb of Evelyn Lake 100.1±8.5 ka of Bogard Buttes (Units 1–6; 8–12) Poison 106.2±3.6 ka bpc Basalts of Pine Creek (Units 1–3) Lake Qto Till, older Qoo Qou Outwash gravel, 101.0±1.9 ka Outwash chain bt Basalts of Pittville Road (Units 1–4) glaciations gravel, undivided bmc Tholeiitic basalts of 108±14 ka older Mill Creek Plateau m20 Basaltic andesite west of hill 2078 glaciations Middle Pleistocene and older volcanic rocks 108.6±2.1 ka bs Basalts of Stephens Campground (Units 1–5) 110.8±3.8 ka 101.5±8.7 ka br Basalts of Robbers Spring (Units 1–5) 125 ka* 143±6 ka mbg Basaltic andesite of Little Bunchgrass Meadow ? ? ? mbx Basaltic andesite of Box Canyon 167±4 ka Basalts and basaltic bsm msm 172±23 ka andesites of Sifford Basaltic andesite of Small Butte

Brunhes (+) Mountain

193±11 ka rd Rhyodacite of Dersch Meadows 199±22 ka bec Tholeiitic basalt of 190±18 ka b44 Tholeiitic basalt of b18 Tholeiitic basalt 188±32 ka Eagle Canyon Calif. Hwy 44 of hill 1879 amh Andesite and basalt of Mount Harkness 210±120 ka 212±5 ka dr Dacite of Reading Peak 232±8 ka db Dacite of Bumpass Mountain bn Tholeiitic basalt of Nobles Trail 236±1 ka dc Dacite of Crescent Crater mm Basaltic andesites of 202.0±2.2 ka bl35 Basalt of section 35 Qs82 Avalanche deposit 244±10 ka ds Dacite of Ski Heil Peak Magee Volcano from dacite of 247±56 ka ap Andesite and basaltic andesite bl2 Basalt of section 2 bl20 Basalt of hill 2088 249±12 ka dh Dacite of Mount Helen hill 8283 of Prospect Peak Cone bl30 Basalt of section 30 duh Dacite under Mount Helen dsc Dacite of acl Andesite and basaltic Summit Creek andesite of Cluster Lake 220±14 ka bl22 Basalt of hill 2232 dpl Dacite of Lassen Peak parking lot dv Dacite of Bumpass Lakes chain bl21 Basalt of hill 2109 261±5 ka d82 Dacite of hill 8283 Vulcans Castle sequence ? mlc Basaltic andesites of Cone Lake ml18 Basaltic andesite of hill 1868

270±18 ka arp Andesite of Raker Peak pdh Lithic tephra from dmz Dacite of upper Manzanita Creek Triangle Deep Hole mtr Lake 277±22 ka Basaltic andesite of Triangle Lake sequence mt20 Basaltic andesites of section 20

297±1 ka rmz beb Basalts of Bond Valley (Units 1–3) Rhyodacite of Manzanita Chute mhl Basaltic andesite of Echo Twin Lakes sequence, older Twin 302±7 ka bsl Basalt of Lost Spring Lake 302±36 ka mee 298±9 ka rmc Rhyodacite of Mount Conard Huckleberry Lake Basaltic andesites of Echo Lake (Units 1–2) bsd Basalt of Duck Lake sequence mes rlm Rhyodacite of Loomis Peak Basaltic andesite of Star Butte 313±8 ka av Andesite of Viola bct Basalt of bo Basalt of Onion Springs Island bii Basalt of mce Basaltic andesite mcj Basaltic andesite mcr Basaltic andesite Cherry Caribou Thicket awp Andesites of West Lake Island Lake of Eleanor Lake of Jewel Lake of Rim Lake Prospect Peak Sunrise chain mcn Basaltic andesites of North Caribou (Units 1–8) bbf Basalt of Badger Flat sequence 331±45 ka bie Basalt of QUATERNARY Peak East Lake bcs Basalt of South Caribou sequence 362±33 ka mcm Basaltic andesite of middle Caribou Caribou bcw mch Basaltic andesite of Hay Meadow Basalt of sequence Caribou mc71 Basaltic andesite of hill 7114 Wilderness bs72 Basalt of hill 7243 bci Basalt of Indian Meadow 393±4 ka bss Basalts of Sunrise Peak (Units 1–2) 400±14 ka mc Basaltic andesites of 387±10 ka amd Andesite of Mount Diller bsb Basalt of Bathtub Lake bcp Basalt of Silver Lake (Units 1–11) Caribou Peak Qwb Debris-flow deposit bcb from Brokeoff Volcano Basalt of Cowboy Lake

Beauty bbb Basalt of Beauty Lake MIDDLE PLEISTOCENE Diller Lake bbp Basalt of Posey Lake ad Andesites of Diller sequence sequence bbh Basalt of Hidden Lakes sequence, undivided

amz Andesite of Manzanita Creek 451±10 ka adc Andesite of Digger Creek ag Andesite of Glassburner Meadows 467±10 ka abf Andesite of Bluff Falls quarry Brokeoff Volcano Brokeoff 477±14, 485±12 ka ar Andesite of Rice Creek 470±10 ka dt Dacite of Twin Meadows 472±9 ka 473±10 ka Mill Canyon 506±14 ka amc Andesites of sequence 534±27 ka Mill Canyon 555±18 ka 562±12 ka mhr Basaltic andesite of Hootman Ranch Older volcanic rocks 591±13 ka aw Andesite of Wilcox Peak

bgv Tholeiitic basalt 609±7 ka pr Rockland tephra alg Andesite of Logan Mountain 610±22 ka bwv Tholeiitic basalt of of Grays Valley 588±69 ka rr of Raker Peak Warner Valley agr Andesite of Grayback Ridge mj Basaltic andesite bhr Basaltic plug near Heckle Ranch bcg Basalt of Butte of Jakey Lake Creek Campground 650±20 ka 667±24 ka mb Basaltic andesite of bsh acs Basalts and basaltic Black Cinder Rock boc Older basalts and basaltic andesites 672±20 ka drr Dacite of Red Rock Mountain 690±34 ka Andesite of Cabin Spring andesites of Swains Hole msn Basaltic andesites bnt Basalt of Bonte Peak south of Caribou Volcanic Field 679±14 ka dbl Dacite of Bench Lake mr Basaltic andesite of Rock Spring and basalt of ao Andesite of Onion Creek ? ? Snag Lake ?

at Andesite of 708±21 ka abm Andesites of Badger Mountain Table Mountain btb Tholeiitic basalt of Twin Bridges dbc Dacite of Bailey Creek 788 ka*

803±27 ka drp Dacite of Rocky Peak Rockland complex aa Andesite of Ashpan Butte bcr Basalt of Butte Creek Ranch 812±6 ka dfr Dacite of Flatiron Ridge dpg Dacite of dch Dacite of dmm Dacite of dcy Dacite of Plantation Gulch Christie Hill Morgan Mountain Canyon Creek msg Basaltic andesite of Signal Butte 827±18 ka dp Dacite of Panther Creek a16 Andesite of section 16 924±24 ka abl Andesite of Butte Lake 989±49 ka brk Tholeiitic basalt of Rock Creek a22 Andesite of section 22 1,080±26 ka mgp Basaltic andesite of Grays Peak dhm Dacite of Huckleberry Mountain 1,105±49 ka bpa Basalt of Panther Creek

amr Andesite of Martin Creek ahc Andesites, basaltic andesites, and basalts of Hat Creek Rim 1,320±40 ka acc Andesites of Cowslip Campground

rd3 PLEISTOCENE EARLY 1,273±7 ka of Dittmar Stage 3 1,150±70 ka Volcanic Center, Stage 3 rb Rhyolite of rmp Rhyolite of Mill 1,305±10 ka rlp Rhyolite of Lost rsm Rhyolite of 1,400±37 ka am Older regional andesites and 1,240±110 ka Blue Ridge Creek Plateau Creek Plateau North Stover mcf Basaltic andesites of basaltic andesites,undivided 1,398±42 ka ad2 Andesites of Dittmar adm Andesite ads Andesite of ab Andesite Mountain Camp Forward 1,570±35 ka msw Basaltic andesites of Swain Mountain Stage 3 Rhyodacite of Volcanic Center, of Doe Domingo of Benner Stage 2 rg 1,645±35 ka Gurnsey Creek 1,650±35 ka Stage 2, undivided Mountain Spring Creek 1,738±46 ka mbc Basaltic andesites of South Fork Battle Creek 1,710±42 ka b11 Basalt of section 11 1,810 ka* 1,785±35 ka ?

Matuyama (-) ?

Tah Andesites of Hampton Butte Taw Andesites of Wild Cattle Mountain 2,105±25 ka, 2,120±46 ka, Tdm of Maidu Volcanic Center, 2,140±42 ka, 2,259±46 ka Stage 2 Stage 2, undivided Tad Andesites of Dittmar Volcanic Center, Stage 1, undivided 1,905±42 ka, 2,045±42 ka, 2,166±67 ka Tab Andesite of South Fork Battle Creek Stage 1 2,152±47 ka, 2,250±49 ka, Tam Andesites of Maidu 2,325±49 ka, 2,375±49 ka Tml Basaltic andesite of Lassen Lodge Volcanic Center, Stage 1 2,225±49 ka 2,200±49 ka Stage 1, undivided Tdb Dacite of Bogard Buttes 2,350±70 ka 2,315±29 ka 2,307±32 ka 2,345±49 ka Tac Andesite of Cal Mountain 2,455±49 ka Tbm Basalts and basaltic andesites of Mud Creek Rim TERTIARY 2,575±57 ka Tmc Basaltic andesite of Cone Mountain PLIOCENE 2,580 ka*

Tt Tuscan Formation Tmsr Basaltic andesites 2,785±16 ka of Susan River

? 3,140±67 ka Tlv Rocks of Latour Volcanic Center

? Gauss (+)

* Polarity Epoch and Age (ka) [nonlinear time scale]

Geologic Map of Lassen Volcanic National Park and Vicinity, California By Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. Michael A. Clynne and L.J. Patrick Muffler For sale by U.S. Geological Survey, Information Services, Box 25286, Federal Center, Denver, CO, 80225, 1–888–ASK–USGS 2010 Digital files available at http://pubs.usgs.gov/sim/2899/