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Screen Optimized PDF File U.S. DEPARTMENT OF THE INTERIOR MISCELLANEOUS FIELD STUDIES MAP MF–2404 U.S. GEOLOGICAL SURVEY Version 1.1 Qalo Qesy o4 CORRELATION OF MAP AND SUBSURFACE UNITS by 1–6 m of basalt-rich, angular cobble and boulder Loma Machete quadrangle (Personius and others, 2000), 10.94±0.03-Ma tephra (A. Sarna-Wojcicki, written Table 1. Correlation chart for alluvial deposits of the Jemez River 107˚00' 106˚45' 106˚30' 106˚15' Qesy Qesy 35˚30' J 73 gravel (unit Qalo) derived from Santa Ana Mesa. and also roughly correlates with undifferentiated middle commun., 2001) from Snake River Plain/Yellowstone (upstream is to left), indicated by map unit symbols. e Santa Ana Tzcc Qesy/Qaly m e Correlative with unit Qt4 deposits of Rogers (1996) and unit of Cochiti Formation of Manley (1978). Mapped as hotspot in southern Idaho. Another ash in this subunit, [Units in bold type shown on this map. Leaders (--) indicate that deposit not mapped z Pueblo Qesy R in quadrangle] iv MF–2405 Qalo Rogers and Smartt (1996), Formento-Trigilio and western facies of unnamed upper formation of Santa Fe located in sec. 9, T. 14 N., R. 2 E. (sample locality M1), e Qesy r Qalh Qalo + Qaly o 73 ARTIFICIAL ARROYO EOLIAN JEMEZ BEDROCK 25 Qaly Qalo 15 Pazzaglia (1996, 1998), Formento-Trigilio (1997), Group by Spiegel (1961) and as undivided Santa Fe also has chemical and shard characteristics typical of Ponderosa Jemez Pueblo Bernalillo NW Santa Ana Bernalillo NW 4 70 63 Qesy FILL ALLUVIUM DEPOSITS RIVER Pazzaglia (1998), and Pazzaglia and others (1998), Formation by Kelley (1977). In adjacent Cerro Conejo Snake River Plain/Yellowstone hotspot sources; 1 MF–2404 Qesy Qalo 15 quadrangle and San quadrangle Pueblo o Tzcc ALLUVIUM 3 Qaly 9 mapped upstream of quadrangle, and with unit Qaj3 of (Koning and others, 1998; Connell and others, 1999) preliminary chemical matches are to 11.31±0.10-Ma Ysidro quadrangle o Qesy 2 71 o Personius (2002) mapped downstream of quadrangle and Bernalillo (Connell and others, 2000) quadrangles, tephra in the Aldrich Station section of western Nevada quadrangles Bernalillo 75 Qalo Loma Machete (table 1). Thickness 4–10 m ashes from the middle part of Loma Barbon Member and Trapper Creek section of southern Idaho (A. Sarna- o Qt9 Qt6 Qaj6b Qaj6 MF–2334 Qesy/Qaly 80 Qesy QalhQesd Qalh Qalo Qf historic Qaj2 Alluvium 2 of Jemez River (middle Pleistocene)—Sandy yield 40Ar/39Ar ages of 6.8 Ma, indicating an upper Wojcicki, written commun., 2001), and to an ash with Qesy 10 65 pebble and cobble gravel; moderately sorted and Miocene age for middle part of unit. Possibly correlative very similar chemistry on north side of Jemez River Qt7, Qt8 Qt5 Qaj6a Qaj6 Qaj6b Holocene deposits may underlie 2.5- to 2.6-Ma (Bachman and (sample locality SPT8/26/97–1). However, the ash on 35˚15' S Qesy Qesy/Qaly Qaly Qesy moderately to well bedded. Clasts are subangular to Qt5? Qt4a? Qaj5 Qaj5 N SANDOVAL COUNTY Rio T Qalh Qesy/Qaly round and well imbricated, show southeast transport Mehnert, 1978; Smith and Kuhle, 1998) basalts of north side of Jemez River was probably deposited in the M Qaj6a Qt5? Qt5a, Qt4a? Qaj4 -- BERNALILLO COUNTY Rancho A Santa Ana Mesa (Cather and Connell, 1998; Connell middle subunit, so either the upper and middle subunits I directions, and are dominated by rocks that are common D Qesy and others, 1999, 2000); such correlations support are diachronous or the chemical correlations are N Rio o in source areas to northwest (Sierra Nacimiento and Qt4 Qt4 Qaj3 Qaj3 A Qesy S 7 upper Jemez Mountains). Unit poorly preserved as 1- to 2-m- a Pliocene age for upper part of unit. Thickness incorrect. Subunit is poorly indurated, easily eroded, and Grande 65 70 Qt3 Qt3 Qaj2 -- Albuquerque rift Qaj5 Pleistocene thick deposits in two small hills along eastern edge of the 120–180 m poorly exposed. Subunit correlates with unit 8 of Qalo Tzcc o15 Qeso ? Connell and others (1999) and is approximately Qt2 Qt2 -- Qaj1 Qesy/Qaly quadrangle, north of Jemez River. Deposits overlie Ton Navajo Draw Member of Connell and others (1999) 8/26/97-1 40 o 100–130 m thick Qaly bedrock straths 50–60 m above present channel of (upper Miocene)—Undifferentiated member consists of 1Sources: Rogers (1996) and Rogers and Smartt (1996) 25 Qaj4 e o Qesy o 40 + Middle subunit—Pink to very pale brown (7.5–10YR 2 d Qalo 20 Jemez River, and commonly are in turn overlain by four subunits dominated by yellow to light-yellowish- Sources: Formento-Trigilio and Pazzaglia (1996, 1998), Formento-Trigilio (1997), n 12 a New Mexico 75 r 7 T 8/4 and 10YR 7/4–5), fine- to medium-grained Pazzaglia (1998), and Pazzaglia and others (1998) o 1–2 m of basalt-rich angular cobble and boulder gravel brown to very pale brown sandstone, silty sandstone, G 60 Tzcc L c 3 o Qaj6b 16 Source: Personius (2002) Ri U sandstone; reddish to reddish-brown sandy claystone and o Ton Qaj3 (unit Qalo) derived from Santa Ana Mesa. Probably mudstone, and pebble conglomerate beds. Unit is 35˚00' Qeso A Qalo ? middle clayey sandstone make up as much as 10 percent by F QUATERNARY correlative with unit Qt3 deposits of Rogers (1996), 10–30 percent thin to thick, tabular-bedded sandy 12 20 o Pleistocene volume. Deposits form internally massive, thin to thick, INDEX MAP A Qaj2 Rogers and Smartt (1996), Formento-Trigilio and mudstone. Sandstones are thinly bedded to medium N Pazzaglia (1996, 1998), Formento-Trigilio (1997), bedded and lenticular or tabular, subangular to subround, tabular beds; minor horizontal or low-angle cross Qesy A 40 39 75o laminations occur in some sandstone beds. Subunit is Table 2. Results of Ar/ Ar dating in Bernalillo NW quadangle. Tonl Qesy/Qaly o Pazzaglia (1998), and Pazzaglia and others (1998), well sorted, and feldspathic to quartz-rich feldspathic in Qesy/Qaly A 2 o 12 fossiliferous, particularly in mudstone beds within pink [All data are from L. Peters (written commun. to S.D. Connell, 2000; New Mexico Geochronological Research Laboratory Internal Report NMGRL-IR-67)] T Qaj1 mapped upstream of quadrangle (table 1); unit Qt3 composition. Conglomerate volume decreases ? Qesy Qesy/Qaly 13 * Tzcc Tzcc N deposits are inset 30–60 m below deposits that contain northwest to southeast from ≈5 percent to <0.5 percent and green sandstone intervals, and locally is ash-rich. A A 1 Qaly o 63 Ton 60-cm-thick, greenish-gray ash altered to a soapy texture Field NMGRL Sample locality Map Description of sample Mineral Weighted mean 8 20 S Lava Creek B ash, so unit Qaj2 deposits are inferred and occurs primarily in lenticular to channel-shaped ? o 60 Qaly 48 o *Unit located in adjacent sample Lab (UTM coordinates, unit locality dated age o o to be younger than the ≈640 ka age (Lanphere and beds. Clast imbrication, channel trends, and cross- is located in sec. 3, T. 14 N., R. 2 E.; ash has 2–5 4 No. Number zone 13, NAD 1983) ± 2 sigma o Santa Ana Pueblo quadrangle 76 6 Qesy Qaly 12 others, 2002) of these older deposits. Preserved stratification within conglomerate beds indicate southeast percent black dendritic minerals (probably manganese 11 ? (Personius, 2002); see table 1 2 9 oxide) with long diameter of about 1 mm. This ash may 9 Qalh o thickness 1–2 m transport directions. Conglomerate clasts consist of 1–3 11C 50518 3921000 N; 344130 E Tob Single hornblende-bearing tephra clast in a Single crystal 7.38±0.03 Ma Tzcci o Qaly o 79 4 65 lower o 73 15 percent red to yellow siltstone, 10–35 percent brown correlate with "lower ash" in adjacent Cerro Conejo bouldery channel deposit. biotite. 75 Pleistocene 11E 50516 3920970 N; 342720 E Tob Channel deposit (≈4 m thick) of conglomerate Single crystal 7.02±0.06 Ma Qalh BEDROCK chert, 3–25 percent sandstone, 5–15 percent quartz or quadrangle (Koning and others, 1998) and with thick ash Qesy and sandstone; upper 10–100 cm composed of sanidine. Santa Fe Group quartzite, <2 percent petrified wood, ≤5 percent pink of unit 6c of Connell and others (1999). Several ash Qesy/Qaly pumice pebbles. Qesy 62 Significant revisions of the Santa Fe Group have recently been proposed granite,≤5 percent basalt, <5 percent rhyolitic tephra, outcrops on north side of Jemez River have similar 8h-1 50485-01 3919210 N; 342704 E Toc Basalt cobble Groundmass 6.52±0.20 Ma3 o o Qaj6a o 75 by Koning and others (1998) and Connell and others (1999) in the trace Pedernal Chert Member of Abiquiu Formation, and soapy texture and black dendritic minerals; most are in concentrate. 64 12 3 5 single, 60- to 100-cm-thick thick beds, but westernmost o 8 Tocf adjacent Cerro Conejo quadrangle. However, this nomenclature is >30 percent intermediate to felsic volcanic rocks. Unit is 8h-2 50486-01 3919210 N; 342704 E Toc Basalt cobble Groundmass 8.31±0.18 Ma o Qesy Pliocene 11 11 Toc preliminary, and other recent studies have suggested alternative outcrop in sec. 30 and 31, T. 15 N., R. 3 E. expose two concentrate. Qaly Tzcc o moderately exposed. Navajo Draw Member has 3* o 12 o 12 8h-3 50487-01 3919210 N; 342704 E Toc Basalt cobble Groundmass 6.89±0.26 Ma 11 76 terminology (for example, Pazzaglia and others, 1999; Tedford and ashes (upper 60-cm-thick ash and lower 30-cm-thick ash) Tzcc o gradational, interfingering contact with underlying Cerro 75 68 concentrate.
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