2010 Overboard in the Mojave - Biological Science - California State ...

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of the Calico Fault, tubular stromatolites of the MSL. The internal mold of a flamingo egg was found below the Burcham Mine, reinforcing the environment of a shallow lake margin (Reynolds, 1998). PROCEED WEST to Ft. Irwin Road. 17.5 (234.0) (1.7) Stop at Ft. Irwin Road; TURN RIGHT (north). 21.5 (4.0) Continue past Old Ft Irwin Road and proceed northeast toward Pickhandle Pass. 22.4 (0.9) Slow, TURN RIGHT (southeast) at the BLM kiosk onto a road to the northwest Calico Mountains. Proceed approximately one mile to the southeast until the road bends and enters narrows. 23.3 (0.9) STOP M-9—Russ’ Mailbox Locality in northwest Calico Mountains. The thick section of BPL overlies19Ma Pickhandle dacite. The dacite outcrop is r. e. reynolds and d. m. mller Stop M-8. Cemetery Ridge. A white tuff (above backpack) provided zircon dates of 19.1 Ma. Resistant beds to the right are brown limey sandstone. Stop M-8. Replica of fossil flamingo egg (center) found below Burcham mine, flanked by eggs of lesser flamingo (left) and greater flamingo (right). covered by rounded and sub-rounded pebbles suggesting a long period of weathering, therefore, the age of the BPL is later than the weathered dacite. The BPL contains approximately 50% pebbles at its base, but becomes finer upward and has vertically oriented pores that resemble the texture of the tufa at Travertine Point on the west side of the Salton Sea. This five-m-thick section of BPL may represent a lacustrine onlap sequence. RETRACE to Ft. Irwin Road. 24.3 (1.0) Stop at Ft. Irwin Road, TURN LEFT (southwest). 25.1 (0.8) TURN RIGHT (northwest) on Old Ft Irwin Road; proceed west toward Fossil Bed Road. 29.4 (4.3) Continue past Copper City Road. 30.3 (0.9) TURN RIGHT (west) on Fossil Bed Road. 33.2 (2.9) TURN RIGHT (northwest) on Rainbow Basin Loop Road. Stop M-9. Northwestern Calico Mountains. A single brown platy limestone (BPL)at this locality is 5+ meters thick, and is interpreted as a near-shore, on-lapping sequence. The BPL contains sub-rounded dacite pebbles at its base, and becomes platy and spongy textured toward the top. 16 2010 Desert Symposium
Stop M-10. Owl Canyon Campground-Space 28. Concentric tufa deposits around plant.View west shows stromatolites (MSL) and two brown platy limestone (BPL) beds. U-Pb dates on stromatolite calcite at the campground are 15.3 Ma. Stromatolites of the MSL were deposited over a 1 my period at different portions of the basin. One mile west, the marker sequence (MSL, BPL, SrB) spans 0.8 Ma, with the MSL dating to approximately 16.8 Ma. 33.5 (0.3) Turn Right (north) on Owl Canyon Road, enter Campground and PARK at space #28. 35.0 (1.5) STOP M-10—Owl Canyon Campground. View west across wash of stromatolitic limestone phytoherms (tufa around branching bushes) and two brown platy limestone beds. Cole et al (2005) used U-Pb methods to date branching tufa mounds. Results from three dated localities are 15.39 ± 0.15 Ma and 15.30 ± 0.25 Ma at Owl Canyon Campground, and 16.25 ± 0.25 Ma on the north limb of the Barstow Syncline. Apparently, the MSL was actively depositing over a period of nearly 1 my along the south and north portion of the basin. This would be expected during lacustrine deposition of an expanding basin event in tandem with alluvial fans developing from rising highlands to the north and south. The U-Pb dates may be useful in providing relative ages of lacustrine car- 2010 Desert Symposium overboard in the mojave: a field guide bonates deposited across different portions of the basin. In summary, dates on tubular stromatolites and phytoherms of the MSL from the Mud Hills span a period from 15.3–16.2 Ma. One mile to the west, the entire marker sequence (MSL, BPL, SrB) spans 0.8 Ma, with the MSL dating to approximately 16.7–16.9 Ma (Reynolds and others, this volume). MSL tubes ) RETRACE. 36.8 (1.8) Stop at Fossil Bed Road, TURN LEFT (east). Retrace to Old Ft Irwin Rd. 39.7 (2.9) STOP at Old Ft. Irwin Road. TURN LEFT (northeast) to Ft. Irwin Road. Proceed south to I-15, then east on I-15 to Zzyzx Road and the Desert Studies Center. End Day 2 Day 3 What we will see: early on Day 3, we will continue to explore outcrops of the Peach Spring Tuff, an 18.7 Ma time marker that has been identified in several sub-basins of the Barstow Formation. We will examine the overlying lacustrine deposits of the Barstow Formation near the west end of Daggett Ridge and contrast depositional facies and ages in various sub-basins in the Daggett Ridge area, using the Peach Spring Tuff as the tie point for all stratigraphic sections. Later on Day 3, we will turn to Pliocene (~5 to 2 Ma) deposits, when instead of lakes there were marshes, small shallow ponds, and wetlands (collectively grouped as groundwater discharge deposits). These deposits are typified by white carbonate-rich sand and silt. We will see that several Pliocene deposits of this type were deposited in an east-trending low area from near Helendale to near Barstow, and an even broader area farther south near Victorville. The deposits at Victorville represent the damming of old drainage systems to form a long-lived marshy basin that eventually was filled with sediment, from which the ancestral Mojave River Valley flowed to Barstow and later to Lake Manix. CONVENE at the Desert Studies Center with a full tank of gas. Enter westbound I-15 toward Barstow Road. CAU- TION: when reaching Barstow, I-40 merges with I-15 near Barstow Road. You must be in the far right lane to exit on Barstow Road. 0.0 (0.0) STOP at Barstow Road. Reset odometer. Services are available to the right. TURN LEFT (south) on Highway 247 (Barstow Road) toward Lucerne Valley and proceed through several traffic light intersections. 17
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Yermo Hills) gravels have a norther
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Along Interstate 15, compiled by R.
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econnaissance geochronology of tuff
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2010 Desert Symposium reconnaissanc
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2010 Desert Symposium reconnaissanc
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Stratigraphy, age, and depositional
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stratigraphy, age, and depositional
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2010 Desert Symposium stratigraphy,
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Correlation of the Miocene Peach Sp
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correlation of the miocene peach sp
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Table 1 continued 2010 Desert Sympo
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While in Barstow, Buwalda stayed in
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mammalian litho- and biochronology
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2010 Desert Symposium mammalian lit
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2010 Desert Symposium mammalian lit
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Figure 1a. Locality and outcrop ref
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strontium prospects (Durrell, 1953)
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Mountains site contains 28% CaCO by
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Toomey Hills-Yermo Hills (Emerald B
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14.0 Ma (Pagnac, 2009). The Miocene
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Dokka, R.K. and C.J. Travis. 1990.
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Lister, K. H., 1970, Paleoecology o
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miocene and late pleistocene stickl
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75 years of fieldwork in the Barsto
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75 years of fieldwork in the barsto
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Paleomagnetism of Miocene volcanic
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paleomagnetism of miocene volcanic
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nite and monzodiorite while the met
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geology and tectonic development of
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geology and tectonic development of
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Basalt is present east of the axis
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Schermer, E.R., Luyendyk, B.K., and
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2010 Desert Symposium camel tracks
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The Palm Borate Company operations,
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Claim Name Section 2010 Desert Symp
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Geology and ore genesis of epitherm
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geology and ore genesis of epitherm
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Figure 2. Cladoplebis sp. equal len
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Figure 8. c.f. Adocus sp. ogy to Gl
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Figure 13. Iguanodont tooth. Figure
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Hickey, L.J. and Doyle, J.A., 1977,
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3 are extremely rare. Member 4 is s
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new marine sites from member 4d of
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new marine sites from member 4d of
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Plantae Pieces of fossil wood (some
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A juvenile specimen of Archaeohippu
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2010 Desert Symposium a juvenile sp
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Table III: Lower tooth measurements
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Pagnac, D. C. 2009. Large mammal bi
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early pleistocene range extension f
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2010 Desert Symposium early pleisto
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The first tungsten-mining boom at A
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Atolia in 1909. USGS Hess. Their sh
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them a fine concentrating propositi
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St. Elmo Dist. etc. What I would li
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article which was published in the
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in sight and that after a little fu
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from this mine.—In drilling for w
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little over 150 feet and runs about
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here and now brand as a deliberate
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[Excerpts:] Thomas McCarthy, the Ra
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Thermal infrared airborne hyperspec
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Figure 3. The Calipatria fault (CP)
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detection of ammonia venting on the
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Kirkland, L. E., K. C. Herr,, and J
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serve the full array of sensitive n
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exposure. The LCROSS experiment was
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Paleomagnetic and radiocarbon recor
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contrast, very little information i
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the fine-grained fluvial sands on t
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lakes between 25 and ~9.9 cal ka, e
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