| Online link | https://geo-nsdi.er.usgs.gov/metadata/open-file/01-31/metadata.faq.html |
|---|---|
| Description | This data set maps and describes the geology of the Conejo Well 7.5 minute quadrangle, Riverside County, southern California. The quadrangle, situated in Joshua Tree National Park in the eastern Transverse Ranges physiographic and structural province, enc |
| Originators | Powell, Robert E. and Cossette, Pamela M. |
| Publication | U.S. Geological Survey Open-File Report 01-31 |
The ARC/INFO version of the Digital Geologic Map of the Apache Canyon 7.5'quadrangle consists of seven coverages: 1) apache_geo - geology Geologic units are delineated by geologic line entities and described by polygons which are attributed with the following set of attribute items in apache_geo.pat. For display purposes, the geology coverage contains a single annotation subclass: anno.geo contains unit labels. > >APACHE_GEO.PAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 8 18 F 5 > 9 PERIMETER 8 18 F 5 > 17 APACHE_GEO# 4 5 B - > 21 APACHE_GEO-ID 4 5 B - > 25 LABL 35 35 C - > 60 PLABL 35 35 C - > 95 NAME 200 200 C - > 295 SHDPS 3 3 I - LABL geologic map unit label, in plain text Alphabetized list of map units symbols (LABL) and the corresponding map unit names (NAME) specified in the Apache Canyon geologic map database (apache_geo.pat): > >Mzd Diorite >Mzg Granite >Pgn Gneiss >Qam Alluvium of modern stream channels >Qda Debris-apron deposits >Qls Landslide deposits, talus, and colluvium >Qoa Old alluvium >Qt Tuff(?) >QTm Morales Formation >Qya Young alluvium >Tac Sandstone and conglomerate of lower Apache Canyon, > conglomerate unit >Tap Sedimentary breccia of Apache Potrero >Tas Sandstone and conglomerate of lower Apache Canyon, > sandstone unit >Tba Basalt >Tbr Sandstone of Blue Rock Spring >Tcl Caliente Formation, lower part >Tcp Sedimentary breccia and sandstone of Cowhead Potrero >Tcu Caliente Formation, upper part, undivided >Tcu1 Caliente Formation, upper part, unit 1 >Tcu2 Caliente Formation, upper part, unit 2 >Tlc Lockwood Clay >Tnc Sandstone of Nettle Spring and upper part of Caliente > Formation, undivided >Tns Sandstone of Nettle Spring >Tq Quatal Formation >Tql Quatal Formation, lower part >Tsc Sandstone and conglomerate >Tsh Sandstone and shale, lower thin-bedded sandstone and > shale unit >Tsi Simmler(?) Formation >Tss Sandstone and shale, upper sandstone unit >Tv Vaqueros Formation > PLABL coded geologic map unit label used to generate plot labels with relevant stratigraphic symbols. The geologic units with LABL Mzd and Mzg (Mesozoic), and Pgn (Proterozoic) appear as }d, }g, and <gn respectively in the item PLABL. The replacement characters call their corresponding symbols from the Stratagem Font Group, currently publicly available at the following Web site http://pubs.usgs.gov/of/1999/of99-430/ Geologic map unit labels will plot on derivative map plots with appropriate stratigraphic symbols if PLABL is used as the source of unit labels. NAME geologic name of each unit SHDPS polygon color from shadeset scamp2.shd (included in the data package) Geologic lines, which include features such as faults, contacts, and marker horizons are attributed with the following set of feature attribute items contained in apache_geo.aat. (A complete description of each line type is available in the data table, lines.rel.) > >APACHE_GEO.AAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 FNODE# 4 5 B - > 5 TNODE# 4 5 B - > 9 LPOLY# 4 5 B - > 13 RPOLY# 4 5 B - > 17 LENGTH 8 18 F 5 > 25 APACHE_GEO# 4 5 B - > 29 APACHE_GEO-ID 4 5 B - > 33 L-TAG 25 25 C - > 58 L-SYMB 3 3 I - > > L-TAG line tag which consists of a character and numerical value, e.g. C17, allows the user to relate the line entity to its corresponding definition in lines.rel List of line types used in the Apache Canyon geologic map coverage (apache_geo.aat), including abbreviated descriptions from lines.rel: >C1 Contact, generic, observable, location meets map accuracy > standard >C17 Contact, landslide, observable, location meets map > accuracy standard >C19 Contact. landslide, inferrred, location may not meet map > accuracy standard >C29 Contact, sedimentary, observable, location meets map > accuracy standard >C30 Contact, sedimentary, observable, location may not meet > map accuracy standard >C31 Contact, sedimentary, inferred, location may not meet map > accuracy standard >C34 Contact, sedimentary, questionable, location may not meet > map accuracy standard >C50 Contact, igneous, observable, location may not meet map > accuracy standard >CL1 Cartographic line, map boundary >F1 Fault, high-angle, generic, observable, location meets > map accuracy standard >F13 Fault, high angle, generic, inferred, location may not > meet map accuracy standard >F177 Fault, low angle, thrust, location meets map accuracy standard >F180 Fault, low angle, thrust, location may not meet map accuracy > standard >F19 Fault, high-angle, slip unspecified, inferred, location may > not meet map accuracy standard >F22 Fault, high-angle, normal slip, covered, location may not > meet map accuracy standard >F34 Fault, high-angle, normal slip, questionable, location may > not meet map accuracy standard >F35 Fault, high-angle, reverse, questionable, location may not > meet map accuracy standard >F4 Fault, high-angle, normal slip, certain, location meets > map accuracy standard >F40 Fault, high-angle, normal fault, inferred, location may not > meet map accuracy standard >F41 Fault, high-angle, reverse, questionable, location may not > meet map accuracy standard >F5 Fault, high-angle, reverse, certain, location meets map > accuracy standard >F73 Fault, low angle, slip unspecified, certain, location meets > map accuracy standard >GF9 Ground-failure crown scarp, located well but may not meet > map accuracy standard >MH11 Mapped marker horizon, located well but may not meet map > accuracy standard > L-SYMB calls up the appropriate line symbol from the lineset geoscamp2.lin (included in the data package) 2) apache_str - structural lines The attribute values, L-TAG and L-SYMB, link the line tag to the data table, lines.rel and call up the appropriate line symbol from the lineset geoscamp2.lin respectively. > >APACHE_STR.AAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 FNODE# 4 5 B - > 5 TNODE# 4 5 B - > 9 LPOLY# 4 5 B - > 13 RPOLY# 4 5 B - > 17 LENGTH 8 18 F 5 > 25 APACHE_STR# 4 5 B - > 29 APACHE_STR-ID 4 5 B - > 33 L-TAG 25 25 C - > 58 L-SYMB 3 3 I - > > List of line types used in the Apache Canyon structural map coverage (apache_str.aat), including abbreviated descriptions from lines.rel: >FA34 Fold axial trace, anticline, upright, observable, location > may not meet map accuracy standard >FA35 Fold axial trace, anticline, upright, questionable, location > may not meet map accuracy standard >FA36 Fold axial trace, anticline, upright, inferred beneath > mapped covering unit, location may not meet map > accuracy standard >FA50 Fold axial trace, anticline, overturned, observable, location > may not meet map accuracy standard >FA51 Fold axial trace, anticline, overturned, inferred, location > may not meet map accuracy standard >FA52 Fold axial trace, anticline, overturned, inferrerd beneath > mapped covering unit, location may not meet map > accuracy standard >FA98 Fold axial trace, syncline, upright, observable, location > may not meet map accuracy standard >FA99 Fold axial trace, syncline, upright, inferred, location may > not meet map accuracy standard >FA100 Fold axial trace, syncline, upright, inferred beneath mapped > covering unit, location may not meet map accuracy > standard > 3) apache_pts - geological point data Geological point data includes information describing the types and the orientation of bedding and foliation. One annotation subclass is included in the geologic points coverage: value displays the respective dip values associated with individual point data. > >APACHE_PTS.PAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 8 18 F 5 > 9 PERIMETER 8 18 F 5 > 17 APACHE_PTS# 4 5 B - > 21 APACHE_PTS-ID 4 5 B - > 25 P-TAG 25 25 C - > 50 P-SYMB 3 3 I - > 53 P-DIP 3 3 I - > 56 P-STRIKE 3 3 I - > 59 P-DIPDIR 3 3 I - > > P-TAG point tag which consists of a character(s) and numerical value, e.g. FN42, allows the user to relate the point entity to its corresponding definition in the data table, points.rel P-SYMB calls the point-type from the markerset geoscamp2.mrk (included in the data package) P-DIP the dip of planar features P-STRIKE the azimuth strike of planar features Point types (quantitative orientation data) in apache_pts.pat and their corresponding, abbreviated descriptions from points.rel: > >B1 Bedding attitude, sedimentary, horizontal >B2 Bedding attitude, sedimentary, inclined >B4 Bedding attitude, sedimentary, vertical >B6 Bedding attitude, sedimentary, overturned >FC4 Fault dip direction >FN2 Foliation attitude, inclined >FN42 Foliation attitude, metamorphic, inclined > P-DIPDIR azimuthal direction of dip To date, there is no other way to indicate to the user the cardinal direction of dip using the traditional convention (traditional geologic notation allows a quadrant designation following the dip value). 4) apache_ptsorn - structural line ornamentation The point data included in apache_ptsorn allow a visual representation of the type of structural linear feature, e.g. anticline and syncline symbols. The items P-TAG and P-SYMB link the point tag to its full description in points.rel and call up the appropriate point symbol from geoscamp2.mrk. > >APACHE_PTSORN.PAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 8 18 F 5 > 9 PERIMETER 8 18 F 5 > 17 APACHE_PTSORN# 4 5 B - > 21 APACHE_PTSORN-ID 4 5 B - > 25 P-TAG 25 25 C - > 50 P-SYMB 3 3 I - > > Point types (fold axes ornamentation) in ap_ptsorn.pat and their corresponding, abbreviated descriptions from points.rel: > >FC1 Fault attribute, bar and ball on downdropped block >FAC4 Fold ornament, anticline, upright axial plane >FAC5 Fold ornament, anticline, overturned axial plane >FAC10 Fold ornament, syncline, upright axial plane > 5) apache_sample - sample localities A single sample locality, Tuff locality, is representd in ap_sample. > >APACHE_SAMPLE.PAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 8 18 F 5 > 9 PERIMETER 8 18 F 5 > 17 APACHE_SAMPLE# 4 5 B - > 21 APACHE_SAMPLE-ID 4 5 B - > 25 LOCALITY 35 35 C - > 60 P-SYMB 3 3 I - > > 6) apache_ldr - unit annotation leaders Annotation leaders point to unit labels that are placed outside the perimeter of a particular geologic polygon. These cartographic line entities are attributed with only a single attribute, L-SYMB, and all have the same value, 1. > >APACHE_LDR.AAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 FNODE# 4 5 B - > 5 TNODE# 4 5 B - > 9 LPOLY# 4 5 B - > 13 RPOLY# 4 5 B - > 17 LENGTH 8 18 F 5 > 25 APACHE_LDR# 4 5 B - > 29 APACHE_LDR-ID 4 5 B - > 33 L-SYMB 3 3 I - > > 7) apache_xs - cross-section lines Three cross-section analyses are represented on the Apache Canyon quadrangle map plot by three lines contained in the coverage apache_xs. Their definitions are identical to those contained in apache_ldr. These cartographic line entities are similarly attributed with only a single attribute, L-SYMB, and all have the same value, 1. The cross-section lines AA', BB', and CC' are designated by annotation contained in the annotation subclass, xsection. The data dictionary tables, lines.rel and points.rel each contain three items: L-TAG and P-TAG establish the links between the .aat, and the .pat to the respective data tables. The items L-DEF and P-DEF, respectively provide the coded definition for an entity. The items L-EXP and P-EXP provide a parsed explanation of the code contained in the corresponding -DEF items.
A complete description of the polygon, line, and point data coding schemes is available in U.S. Geological Survey Open-File Reports 97-859, OFR 97-860, and OFR 97-861 (full source citations follow): Matti, J.C., Miller, F.K., Powell, R.E., Kennedy, S.A., Bunyapanasarn, T.P., Koukladas, Catherine, Hauser, R.M., and Cossette, P.M., 1997b, Geologic-point attributes for digital geologic-map databases produced by the Southern California Areal Mapping Project (SCAMP), Version 1.0: U.S.Geological Survey Open-File Report 97-859 Matti, J.C., Miller, F.K., Powell, R.E., Kennedy, S.A., and Cossette, P.M., 1997c, Geologic-polygon attributes for digital geologic-map databases produced by the Southern California Areal Mapping Project (SCAMP), Version 1.0: U.S.Geological Survey Open-File Report 97-860 Matti, J.C., Powell, R.E., Miller, F.K., Kennedy, S.A., Ruppert, K.R., Morton, G.L., and Cossette, P.M., 1997a, Geologic-line attributes for digital geologic-map databases produced by the Southern California Areal Mapping Project (SCAMP), Version 1.0: U.S.Geological Survey Open-File Report 97-861