<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>5</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Mack, Greg H.</style></author><author><style face="normal" font="default" size="100%">McIntosh, William C.</style></author><author><style face="normal" font="default" size="100%">Leeder, Michael R.</style></author><author><style face="normal" font="default" size="100%">Monger, H. Curtis</style></author></authors><secondary-authors><author><style face="normal" font="default" size="100%">Sellwood, B.W. , eds.</style></author></secondary-authors></contributors><titles><title><style face="normal" font="default" size="100%">Plio-Pleistocene pumice floods in the ancestral Rio Grande, southern Rio Grande rift, USA</style></title><secondary-title><style face="normal" font="default" size="100%">Sedimentary Geology</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">JRN</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1996</style></year></dates><publisher><style face="normal" font="default" size="100%">Elsevier Science B.V.</style></publisher><pub-location><style face="normal" font="default" size="100%">Amsterdam, the Netherlands</style></pub-location><volume><style face="normal" font="default" size="100%">103</style></volume><pages><style face="normal" font="default" size="100%">1-8</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">At least four times during the late Pliocene and early Pleistocene pyroclastic eruptions in the Jemez volcanic field, northern Rio Grande rift, flooded the ancestral Rio Grande with gravel-size pumice.  Following as much as 400 km of fluvial transport, the pumice was deposited in beds 0.2 to 2.0 m thick in the Camp Rice Formation of the southern Rio Grande rift.  A combination of reversal magnetostratigraphy and single-crystal sanidine 40Ar/39Ar dating constrains the ages of pumice-clast conglomerates at 3.1, ~ 2.0, 1.6, and 1.6 Ma.  The coarsest pumice beds (cobbles, boulders) were deposited as antidune-like bedforms in a fluvial channel and as a crevasse-play sheet.  Granule and pebble-sized pumice was deposited as dune bedforms in a fluvial channels and as ripple bedforms on the floodplain.  The abundance of pumice clasts in the gravel fraction (60-100%) suggest very rapid transport downriver, probably in a few days or weeks.  The two older pumice-clast conglomerates correlate with the Puye Formation in the Jemez volcanic field, whereas the younger two are coeval to the Lower Bandelier Tuff and Cerro Toledo Rhyolite.</style></abstract><accession-num><style face="normal" font="default" size="100%">LTER.1996-91422</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Seager, William R.</style></author><author><style face="normal" font="default" size="100%">Mack, Greg H.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Jornada Draw fault: a major Pliocene-Pleistocene normal fault in the southern Jornada Del Muerto</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">JRN</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1995</style></year></dates><volume><style face="normal" font="default" size="100%">17</style></volume><pages><style face="normal" font="default" size="100%">37-43</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The north-northwest-trending Jornada Draw fault, 40 mi (64 km) long, has displaced the hinge area of the Jornada del Muerto syncline approximately midway between the Caballo and San Andres Mountains. Downthrown to the east, the fault forms the eastern boundary of the Caballo horst and the west boundary of a broad half graben that underlies the east part of the Jornada del Muerto in this area. Maximum stratigraphic separation of 1,850 ft (564 m) was measured from the central segment of the fault, but this decreases toward its termination to the north and probably also to the south. In spite of the comparatively large, apparent vertical component of slip, physiographic evidence for the fault is subtle because of the extensive low-relief pediment that truncates both hanging-wall and footwall rocks. Local low scarps, a series of playa lakes, and Jornada Draw drainage are its principal physiographic expressions. However, sedimentary and volcanic rock formations ranging in age from Pleistocene to Cretaceous are truncated by the fault, and a basaltic cinder cone was constructed on the fault in late Pliocene time. There is no stratigraphic evidence that the fault developed earlier than Pliocene time. Pliocene-Pleistocene strata of the Camp Rice and Palomas Formations are syntectonic and reach a maximum known thickness of 250 ft (76 m) on the hanging-wall block, although greater thicknesses may be present in the subsurface. Thus, the fault apparently formed late in the history of the Rio Grande rift region of south-central New Mexico, probably to help accommodate growing structural relief between the Caballo uplift and Jornada del Muerto syncline. Most recent movement of 30 ft (9 m) along the fault is estimated to be approximately 0.4 Ma. Quaternary offset locally exceeds 100 ft (30 m). The earthquake potential of this fault is considered to be minimal.</style></abstract><accession-num><style face="normal" font="default" size="100%">LTER.1995-91465</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Mack, Greg H.</style></author><author><style face="normal" font="default" size="100%">James, W. Calvin</style></author><author><style face="normal" font="default" size="100%">Monger, H. Curtis</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Classification of paleosols</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">JRN</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1993</style></year></dates><volume><style face="normal" font="default" size="100%">105</style></volume><pages><style face="normal" font="default" size="100%">129-136</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Despite increased interest in paleosols during the past decade, no satisfactory classification is in current use.  Presented here is a largely descriptive classification system that utilizes those pedogenic features that have the highest perservation potential in the rock record.  Emphasized in the classification are morphological and mineralogical features that are easily recognizable in the field and through the petrographic microscope.  The classification is based on evaluation of the relative prominence in a plaeosol of six pedogenic features or processes: organic matter content, horizonation, redox conditions, in situ mineral alteration, illuviation of unsoluble minerals/compounds, and accumulation of soluable minerals.  The most prominent of these six features/processes provides the key to classifying a paleosol into one of nine orders.  Four of the order names are borrowed from Soil Taxonomy (Histosol, Spodosol, Oxisol, Vertisol), whereas the other five order names ore presented here for the first time (Calcisol, Gypsisol, Gleysol, Argillisol, Protosol).  The orders may be preceded by one or more subordinate modifiers that describe other important features of the paleosol.  The classification is relatively easy to apply to the rock record and should enhance communication and aid in the standardization of terminology.</style></abstract><accession-num><style face="normal" font="default" size="100%">LTER.1993-91524</style></accession-num></record></records></xml>