| 2.1 Has required elements: nonspatial tables DataSources, DescriptionOfMapUnits, GeoMaterialDict; feature dataset GeologicMap with feature classes ContactsAndFaults and MapUnitPolys | PASS |
| 2.2 Required fields within required elements are present and correctly defined | PASS |
| 2.3 All MapUnitPolys and ContactsAndFaults based feature classes obey Level 2 topology rules: no internal gaps or overlaps in MapUnitPolys, boundaries of MapUnitPolys are covered by ContactsAndFaults | PASS |
| 2.4 All map units in MapUnitPolys have entries in DescriptionOfMapUnits table | PASS |
| 2.5 No duplicate MapUnit values in DescriptionOfMapUnit table | PASS |
| 2.6 Certain field values within required elements have entries in Glossary table | PASS |
| 2.7 No duplicate Term values in Glossary table | PASS |
| 2.8 All xxxSourceID values in required elements have entries in DataSources table | PASS |
| 2.9 No duplicate DataSources_ID values in DataSources table | PASS |
| 3.1 Table and field definitions beyond Level 2 conform to GeMS schema | PASS |
| 3.2 All MapUnitPolys and ContactsAndFaults based feature classes obey Level 3 topology rules: No ContactsAndFaults overlaps, self-overlaps, or self-intersections. | PASS |
| 3.3 No missing required values | PASS |
| 3.4 No missing terms in Glossary | PASS |
| 3.5 No unnecessary terms in Glossary | PASS |
| 3.6 No missing sources in DataSources | PASS |
| 3.7 No unnecessary sources in DataSources | PASS |
| 3.8 No map units without entries in DescriptionOfMapUnits | PASS |
| 3.9 No unnecessary map units in DescriptionOfMapUnits | PASS |
| 3.10 HierarchyKey values in DescriptionOfMapUnits are unique and well formed | PASS |
| 3.11 All values of GeoMaterial are defined in GeoMaterialDict. GeoMaterialDict is as specified in the GeMS standard | PASS |
| 3.12 No duplicate _ID values | PASS |
| 3.13 No zero-length, whitespace-only, or bad null values | PASS |
| MapUnit | DescriptionOfMapUnits | GeologicMap |
|---|---|---|
| CZscp | X | X |
| CZmbq | X | X |
| CZmbp | X | X |
| CZscb | X | X |
| CZmg | X | X |
| Jd | X | X |
| Qal | X | X |
| CZOq | X | X |
| CZmbg | X | X |
| CZmgs | X | X |
| CZum | X | X |
| CZmbs | X | X |
| CZmbcp | X | X |
| CZi | X | X |
| OBJECTID | Source | Notes | URL | DataSources_ID |
|---|---|---|---|---|
| 6 | Neuendorf et al., eds., 2011 | modified from Neuendorf, K.K.E., Mehl Jr., J.P., and Jackson, J.A., eds. 2011. Glossary of Geology (Fifth Edition, Revised). Alexandria, VA. American Geological Institute. 783 p. | https://www.americangeosciences.org/pubs/glossary | AGI_2011 |
| 5 | FGDC, 2006 | Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. | https://ngmdb.usgs.gov/fgdc_gds/geolsymstd.php | FGDC-STD-013-2006 |
| 4 | definitions copied from GeMS, 2020 | U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema)—A standard format for the digital publication of geologic maps: U.S. Geological Survey Techniques and Methods, book 11, chap. B10, 74 p., https://doi.org//10.3133/tm11B10. | https://pubs.usgs.gov/publication/tm11B10 | GeMS_2020 |
| 19 | Wintsch et al., 2010 | Wintsch, R.P., Kunk, M.J., Mulvey, B.K., and Southworth, C.S., 2010, 40Ar/39Ar dating of Silurian and Late Devonian cleavages in lower greenschist-facies rocks in the Westminster terrane, Maryland, USA: Geological Society of America Bulletin, v. 122, no. 5–6, p. 658–677. | https://pubs.geoscienceworld.org/gsa/gsabulletin/article-abstract/122/5-6/658/125487/40Ar-39Ar-dating-of-Silurian-and-Late-Devonian?redirectedFrom=fulltext | GSA_Bull_v122_658 |
| 18 | Krol et al., 1999 | Krol, M.A., Muller, P.D., and Idleman, B.D., 1999, Late Paleozoic defor- mation within the Pleasant Grove shear zone, Maryland: Results from 40Ar/39Ar dating of white mica, in Valentino, D.W., and Gates, A.E., eds., The Mid-Atlantic Piedmont: Tectonic Missing Link of the Appalachians: Geological Soc | https://pubs.geoscienceworld.org/gsa/books/edited-volume/475/chapter-abstract/3799965/Late-Paleozoic-deformation-within-the-Pleasant?redirectedFrom=fulltext | GSA_SP_330_93 |
| 15 | Meyer and Beall, 1958 | Meyer, G., and Beall, R.M., 1958, The water resources of Carroll and Frederick Counties: Maryland Department of Geology, Mines, and Water Resources, Bulletin 22, 355 p. | http://www.mgs.md.gov/publications/reports.html | MGS_Bull_22 |
| 10 | Jonas, 1928 | Jonas, A.I., 1928, Map of Carroll County showing the geological formations: Maryland Geological Survey, scale 1:62,500. | https://ngmdb.usgs.gov/Prodesc/proddesc_90331.htm | MGS_CLGEO1928 |
| 16 | Stose and Stose, 1946 | Stose, A.J., and Stose, G.W., 1946, Geology of Carroll and Frederick Counties, in The Physical Features of Carroll County and Frederick County: Maryland Department of Geology, Mines, and Water Resources, p. 11-131. | http://www.mgs.md.gov/publications/report_pages/County_Reports.html | MGS_CR_CLFR1946 |
| 1 | Kavage Adams, 2025 | this report | http://www.mgs.md.gov/publications/maps.html | MGS_DAMAS2025.1 |
| 21 | Muller, 1994 | Muller, P.D., 1994, Geologic map of the Finksburg Quadrangle, Carroll and Baltimore Counties: Maryland Geological Survey, scale 1:24,000. | http://www.mgs.md.gov/publications/maps.html | MGS_FINKS1994 |
| 12 | Jonas and Stose, 1938 | Jonas, A.I., and Stose, G.W., 1938a. Geologic map of Frederick County and adjacent parts of Washington and Carroll Counties: Maryland Geological Survey, scale 1:62,500. | https://ngmdb.usgs.gov/Prodesc/proddesc_90332.htm | MGS_FRWACL1938 |
| 11 | Cloos, et al., 1964 | Cloos, E., Fisher, G. W., Hopson, C. A., and Cleaves, E. T., 1964, The geology of Howard and Montgomery Counties: Maryland Geological Survey, 373p. | http://www.mgs.md.gov/publications/report_pages/County_Reports.html | MGS_HOWMO1964 |
| 17 | Brezinski and Kavage Adams, 2023 | Brezinski, D.K., and Kavage Adams, R., 2023. Geologic Map of the Libertytown Quadrangle, Frederick and Carroll Counties, Maryland. Maryland Geological Survey, Quadrangle Geologic Map, LIBER2023.OF, scale 1:24,000. | http://www.mgs.md.gov/publications/maps.html | MGS_LIBER2023.OF |
| 8 | Cloos, 1953 | Cloos, E., and Cooke, C.W., 1953, Geologic map of Montgomery County and the District of Columbia: Maryland Department of Geology, Mines and Water Resources, scale 1:62,500. | http://www.mgs.md.gov/publications/maps.html | MGS_MODC1953 |
| 2 | Kavage Adams, R., field observations | Kavage Adams, R., field data collection and interpretations | None | MGS_RKA |
| 3 | Vincett III, W.K., field observations | Vincett III, W.K., field data collection and interpretations | None | MGS_WKV |
| 20 | Krol and Muller, 1995 | Krol, M.A., and Muller, P.D., 1995, Microstructural evidence for dextral shearing within the Pleasant Grove Zone, Maryland: Northeastern Geology and Environmental Sciences, v. 17, no. 2, p. 151-161. | None | NEGEOENV_v17_151 |
| 22 | Pearre and Heyl, 1960 | Pearre, N.C., and Heyl, A.V., 1960, Chromite and other mineral deposits in serpentine rocks of the Piedmont upland, Maryland, Pennsylvania, and Delaware: U.S.Geological Survey Bulletin 1082-K, p. 707-833, plate 40, scale 1:125,000. | https://pubs.usgs.gov/publication/b1082K | USGS_Bull_1082K_707 |
| 14 | Southworth, 1999 | Southworth, S., 1999, Geologic map of the Urbana quadrangle, Frederick and Montgomery Counties, Maryland: U.S. Geological Survey Geologic Quadrangle Map GQ-1768, scale 1:24,000. | https://pubs.usgs.gov/publication/gq1768 | USGS_GQ_1768 |
| 9 | Froelich, 1975 | Froelich, A.J., 1975, Map showing mineral resources of Montgomery County, Maryland: U.S. Geological Survey Miscellaneous Investigations Series, Map I-920-E, scale 1:62,500. | https://pubs.usgs.gov/publication/i920E | USGS_IMAP920_MO1975 |
| 13 | Meyer, 1955 | Meyer, G., 1955, Test drilling and aquifer test in the Marburg schist near Mount Airy, Frederick County, Maryland: U.S. Geological Survey Open-File Report 55-110, 31 p. | https://pubs.usgs.gov/publication/ofr55110 | USGS_OFR_55-110 |
| 7 | Southworth et al, 2008 | Southworth, S., Brezinski, D.K., Drake, A.A., Burton, W.C., Omdorff, R.C., Froelich, A.J., Reddy, J.E., Denenny, D., and Daniels, D.L., 2008, Geologic map of the Frederick 30' x 60' quadrangle, Maryland, Virginia, and West Virginia: U.S. Geological Survey Scientific Investigations Map SIM-2889, scal | https://pubs.usgs.gov/sim/2889/ | USGS_SIM_2889_FREDERICK |
| OBJECTID | MapUnit | Name | FullName | Age | Description | HierarchyKey | ParagraphStyle | Label | Symbol | AreaFillRGB | AreaFillPatternDescription | DescriptionSourceID | GeoMaterial | GeoMaterialConfidence | DescriptionOfMapUnits_ID |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2 | Qal | Alluvium | Alluvium | Quarternary | Poorly- to well-sorted, stratified mixtures of unconsolidated clay, silt, sand, gravel, and cobbles underlying flood plains of nearly all rivers and tributaries. Channels of tributaries are commonly incised into bedrock with alluvium covering and exposed along the banks. Thickness of alluvium is highly variable, and is a function of bedrock, topography, and land-use practices. Locally, thick deposits of alluvium result from accumulation of soil eroded due to agricultural practices of the 19th century (Southworth et al., 2008). Notably thick (>7 ft) and laterally extensive (>400 ft wide) deposits of alluvium are present in Cabin Branch and Kings Valley. | 01-01 | DMU Unit 1 | Qal | 40 | 255,255,179 | None | MGS_DAMAS2025.1|USGS_SIM_2889_FREDERICK | Alluvial sediment | High | DMU01 |
| 3 | Jd | Diabase dikes and sills | Diabase dikes and sills | Jurassic | Medium to dark gray, medium-grained crystalline and equigranular, massive diabase that weathers to characteristic rusty orange-brown surface and rounded boulders. One linear dike from south of Damascus to northeast of Mount Airy mapped on presence of rounded boulders in stream valleys and previous maps (Cloos and Cooke, 1953; Froelich, 1975; Jonas, 1928; Stose and Stose, 1946). | 02-01 | DMU Unit 1 | Jd | 99 | 255,000,000 | None | MGS_DAMAS2025.1|MGS_MODC1953|USGS_IMAP920_MO1975|MGS_CLGEO1928|MGS_CR_CLFR1946 | Coarse-grained, mafic-composition intrusive igneous rock | High | DMU02 |
| 4 | CZOq | Quartz bodies | Quartz bodies | Proterozoic-Ordovician | White, massive, and intensely fractured irregular bodies of quartz. The largest, Annapolis Rock, is over 100 feet thick and was once quarried (Cloos et al., 1964). It occurs just east of the Pautuxent River in the Mather Gorge Formation. Four other smaller (6-12 ft thick) quartz bodies are found in the Marburg Formation. | 03-01 | DMU Unit 1 | _ZOq | 179 | 235,000,102 | None | MGS_DAMAS2025.1|MGS_HOWMO1964 | Quartzite | Low | DMU03 |
| 5 | None | Sams Creek Formation | Sams Creek Formation | None | None | 04 | DMU-Heading1 | None | None | None | None | MGS_DAMAS2025.1 | None | None | DMU04 |
| 6 | CZscb | Sams Creek Formation, metabasalt | Sams Creek Formation, metabasalt | Proterozoic-Cambrian | Greenish gray to medium bluish gray, aphanitic to porphyritic, massive to schistose metabasalt. Includes some breccia composed of angular, fine-grained, dusky blue clasts in fractured green basalt matrix, as well as interlaminated, fine-grained, dark bluish gray and greenish gray metabasalt and white calcite amygdules. Metabasalt is mapped based on float found just northeast of the map area on the Libertytown quadrangle. | 04-01 | DMU Unit 1 | _Zscb | 344 | 204,179,179 | None | MGS_DAMAS2025.1 | Meta-mafic rock | High | DMU05 |
| 7 | CZscp | Sams Creek Formation, phyllite | Sams Creek Formation, phyllite | Proterozoic-Cambrian | Grayish purple, grayish blue, and dark greenish gray phyllite containing white vein quartz and minor slate. No exposures were found on the Damascus Quadrangle; it is mapped based on Libertytown Quadrangle exposures (Jonas and Stose, 1938; Meyer, 1955; Southworth, 1999). | 04-02 | DMU Unit 1 | _Zscp | 153 | 235,204,153 | None | MGS_DAMAS2025.1|MGS_FRWACL1938|USGS_OFR_55-110|USGS_GQ_1768 | Meta-felsic and intermediate rock | High | DMU06 |
| 8 | CZi | Ijamsville Phyllite, undifferentiated | Ijamsville Phyllite, undifferentiated | Proterozoic-Cambrian | Grayish purple, grayish blue, and dark greenish gray phyllite containing white vein quartz and minor slate. Folded and sheared with abundant quartz veins near the Hyattstown fault. No exposures were found on the Damascus Quadrangle; it is mapped based on Libertytown Quadrangle exposures (Brezinski and Kavage Adams, 2023). | 05 | DMU Unit 1 | _Zi | 312 | 204,222,235 | None | MGS_DAMAS2025.1|MGS_LIBER2023.OF | Meta-felsic and intermediate rock | High | DMU07 |
| 9 | None | Marburg Formation | Marburg Formation | None | None | 06 | DMU-Heading1 | None | None | None | None | MGS_DAMAS2025.1 | None | None | DMU08 |
| 10 | CZmbp | Marburg Formation, phyllite | Marburg Formation, phyllite | Proterozoic-Cambrian | Silvery light gray to grayish purple, lustrous, tan-weathering, muscovite-chlorite phyllite interlayered with greenish gray metasiltstone. Coarsens gradationally to the east with corresponding decrease in luster. | 06-01 | DMU Unit 1 | _Zmbp | 242 | 222,222,179 | None | MGS_DAMAS2025.1 | Slate and phyllite, of sedimentary-rock origin | High | DMU09 |
| 11 | CZmbs | Marburg Formation, metasiltstone | Marburg Formation, metasiltstone | Proterozoic-Cambrian | Medium to dark greenish gray metasiltstone interlayered with quartz-paragonite-muscovite-chlorite phyllite. Chloritic laminae commonly alternate with mica-albite-quartz layers. Locally, intervals of dark grayish blue to dark grayish purple phyllite with light gray, quartz-rich layers occur, containing minute (>0.01mm) disseminated flakes of hematite and pyrite. Much of the apparent layering is clearly metamorphic cleavage, but some may be relict bedding. | 06-02 | DMU Unit 1 | _Zmbs | 263 | 222,204,128 | None | MGS_DAMAS2025.1 | Slate and phyllite, of sedimentary-rock origin | High | DMU10 |
| 12 | CZmbq | Marburg Formation, quartzite | Marburg Formation, quartzite | Proterozoic-Cambrian | Light to medium olive gray, medium- to coarse-grained quartzite. Can be foliated, blocky, or massive. Massive intervals are up to 3 feet thick and comprised of subrounded quartz grains in a foliated, fine-grained, recrystallized quartz and mica matrix. Coarse grains of quartz appear bluish in hand sample and euhedral limonite pseudomorphs after pyrite are occasionally present. | 06-03 | DMU Unit 1 | _Zmbq | 404 | 179,179,255 | None | MGS_DAMAS2025.1 | Quartzite | High | DMU11 |
| 13 | CZmbg | Marburg Formation, metagraywacke | Marburg Formation, metagraywacke | Proterozoic-Cambrian | Dark grayish green, foliated metagraywacke comprised of very fine- to fine-grained quartz and plagioclase grains in a chlorite-rich matrix. The largest of these bodies occurs west of Mount Airy. In this location, dark green layers of metagraywacke are divided by 1-3 mm-thick, parallel bands of muscovite and chlorite, forming a crenulation cleavage that indicates compressional folding. | 06-04 | DMU Unit 1 | _Zmbg | 304 | 204,179,255 | None | MGS_DAMAS2025.1 | Quartzite | High | DMU12 |
| 14 | None | Marburg Formation, calcareous material | Marburg Formation, calcareous material | Proterozoic-Cambrian | Calcareous material found in bluish green schist in well cuttings at approximately 50-foot depth in a well field in Mount Airy (Meyer, 1955; Meyer and Beall, 1958). No surficial exposures were found on the Damascus Quadrangle, but may be related to limestone or marble associated with the Ijamsville Formation (Stose and Stose, 1946; Brezinski and Kavage Adams, 2023) or the Silver Run Limestone of the Sams Creek Formation (Stose and Stose, 1946; Fisher, 1978). | 06-05 | DMU Unit 2 | None | None | None | None | MGS_DAMAS2025.1|USGS_OFR_55-110|MGS_Bull_22|MGS_CR_CLFR1946|MGS_LIBER2023.OF | Meta-carbonate rock | Medium | DMU13 |
| 15 | CZmbcp | Marburg Formation, chlorite phyllonite | Marburg Formation, chlorite phyllonite | Proterozoic-Cambrian | Greenish gray, chlorite-sericite phyllonite containing white vein quartz. Foliation surfaces frequently have abundant euhedral magnetite grains ranging from 0.04 to 0.2 inch (1 to 5 mm) in size. 100- to 300-foot (30- to 90-m) wide zones of intense shear are exposed in NE-SW trending ridges cut by the Patuxent River and Scott Branch and marked with wavy lines as seen in lower half of symbol. Sheared outcrops display pervasive S-C shear fabric and thin (0.04- to 0.16-inch / 1- to 4-mm), linear, quartz ribbons that are often isoclinally folded. S-C shear bands on outcrop indicate dextral sense of shear. 40Ar/39Ar dating of white mica in this zone yielded ages of 348 and 363 mya, indicating late Devonian-Mississippian deformation (Krol et al., 1999; Wintsch et al., 2010). | 06-06 | DMU Unit 1 | _Zmbcp | 584 | 153,179,077 | None | MGS_DAMAS2025.1|GSA_SP_330_93|GSA_Bull_v122_658 | Slate and phyllite, of sedimentary-rock origin | High | DMU14 |
| 17 | CZmg | Mather Gorge Formation | Mather Gorge Formation | Proterozoic-Cambrian | Quartz-mica schist and quartzitic metagraywacke interbedded in layers and lenses on a millimeter to meter scale. Quartz-muscovite-chlorite-plagioclase-epidote-magnetite-garnet schist is fine-grained, lustrous greenish gray to gray. Metagraywacke is light to dark olive gray, fine- to medium-grained, with quartz pebbles and graded bedding occasionally visible. Stringers and pods of isoclinally folded and boudinaged white quartz veins are abundant. | 07 | DMU-Heading1 | _Zmg | 185 | 235,153,077 | None | MGS_DAMAS2025.1 | Schist and gneiss, of sedimentary-rock origin | High | DMU15 |
| 18 | CZmgs | Mather Gorge Formation, sheared | Mather Gorge Formation, sheared | Proterozoic-Cambrian | Interbedded quartz-mica schist and quartzitic metagraywacke with penetrative S-C metamorphic fabric, formed by the intersection of the dominant foliation (S) and the shear plane (C) near the Pleasant Grove Fault (Krol and Muller, 1995; Muller, 1994). Mapped on distinct appearance of rotated foliation although lithologically is similar to _Zmg. | 07-01 | DMU Unit 1 | _Zmgs | 184 | 235,179,077 | None | MGS_DAMAS2025.1|NEGEOENV_v17_151|MGS_FINKS1994 | Schist and gneiss, of sedimentary-rock origin | High | DMU16 |
| 19 | CZum | Ultramafic and mafic rocks | Ultramafic and mafic rocks | Proterozoic-Cambrian | Undifferentiated serpentine, magnesian schist, and metagabbro that occur within rocks of the Mather Gorge Formation. The core of the largest body is comprised of light gray to light greenish gray, magnesite-talc schist with yellow, native sulfur and dark green bodies of serpentinite with a distinctive, rounded, fractured weathering surface. Surrounding this body is fine- to coarse-grained actinolite, chlorite, and epidote schist containing 5-30 mm euhedral porphryoblasts of magnesite, chlorite, and magnetite. A second smaller body is mapped based on mine records and previous maps (Froelich, 1975; Pearre and Heyl, 1960), although no outcrop is presently visible at the surface. | 07-02 | DMU Unit 1 | _Zum | 442 | 179,222,179 | None | MGS_DAMAS2025.1|USGS_IMAP920_MO1975|USGS_Bull_1082K_707 | Meta-ultramafic rock | High | DMU17 |
| OBJECTID | Term | Definition | DefinitionSourceID | Glossary_ID |
|---|---|---|---|---|
| 15 | bedding | Formed, arranged, or deposited in layers or beds, or made up of or occurring in the form of beds; esp. said of a layered sedimentary rock, deposit, or formation. The term has also been applied to nonsedimentary material that exhibits depositional layering, such as the "bedded deposits" of volcanic tuff alternating with lava in the mantle of a stratovolcano. | AGI_2011 | GLO12 |
| 1 | certain | Identity of a feature can be determined using relevant observations and scientific judgment; therefore, one can be reasonably confident in the credibility of this interpretation. | FGDC-STD-013-2006 | GLO01 |
| 16 | cleavage | A locally planar fabric in an unmetamorphosed or weakly metamorphosed, fine-grained rock defined by either the tendency of a rock to split in a particular direction, a preferred orientation of crystal planes in mineral grains, or a preferred orientation of inequant grain shapes; it is a product of deformation or metamorphism. | AGI_2011 | GLO13 |
| 14 | contact | A plane or irregular surface between two different types or ages of rock, sediment or other geologic and stratigraphic units. | AGI_2011 | GLO11 |
| 12 | cross section line | A plane or polyline along which a diagram is drawn showing the transected subsurface and topographic features and geology; specifically a vertical section drawn at right angles to the longer axis of a geologic feature. | AGI_2011 | GLO10 |
| 10 | DMU-Heading1 | Header, bolded text, all capitals no indent, 11pt Times New Roman font, 5pt indent. This format is used for groups or headings of formations (with members or subunits) where no group is present. | MGS_DAMAS2025.1 | GLO08 |
| 8 | DMU Unit 1 | Formation style, bolded title, 11pt Times New Roman font. This format is used for largest unit descriptions, usually formations; mapped at the surface, and may or may not contain subunits. | MGS_DAMAS2025.1 | GLO06 |
| 9 | DMU Unit 2 | Minor lithology style. Text description within higher-order units, 11 pt Times New Roman font, italicized for subsurface-only units. | MGS_DAMAS2025.1 | GLO07 |
| 17 | fault | A discrete surface or zone of discrete surfaces separating two rock masses across which one mass has slid past the other. | AGI_2011 | GLO14 |
| 20 | fold axis | A line which, when moved parallel to itself, traces out a folded surface. It applies only in the case of cylindrical folds. | AGI_2011 | GLO17 |
| 21 | foliation | A general term for a planar arrangement of textural or structural geatures in any type of rock, esp. the locally planar fabric in a rock defined by a fissility, a preferred orientation of crystal planes in mineral grains, a preferred orientation of inequant grain shapes, or from compositional banding. In igneous rocks, planar parallelism of flaky or tabular minerals and mineral aggregates, slabby xenoliths, or flattened vesicles as well as compositional layering. In metamorphic rocks, planar parallelism of flaky minerals and compositional layering. | AGI_2011 | GLO18 |
| 3 | High | The selected term in the GeoMaterial field (and its definition) adequately characterizes the overall lithologic nature of rocks and (or) sediments in the map unit. | GeMS_2020 | GLO03 |
| 22 | joint | A planar fracture, crack, or parting in a rock, without shear displacement. | AGI_2011 | GLO19 |
| 23 | lineation | A general, nongeneric term for a locally linear structure or facric in a rock, e.g. flow lines, scratches, striae, slickensides or slickenfibers on a single surface; linear arrangements of components in sediments; or axes of folds. Lineation in metamorphic rocks includes aligned rod-shaped and/or elongate mineral grains, crenulation fold axes, and the lines of intersection between bedding and cleavage or any two sets of oriented surfaces. | AGI_2011 | GLO20 |
| 7 | Low | Either (1) the overall lithologic nature of rocks and (or) sediments in this map unit is not adequately classifiable using the available list of GeoMaterial terms (and their definitions), but the selected term is the best available, or (2) this map unit is not sufficiently known enough to confidently assign a GeoMaterial term. | GeMS_2020 | GLO05 |
| 4 | Medium | The selected term in the GeoMaterial field (and its definition) generally characterizes the overall lithologic nature of rocks and (or) sediments in the map unit, but one or more significant but minor lithologies are not adequately described by the selected term. | GeMS_2020 | GLO04 |
| 11 | neatline | Map Outline | MGS_DAMAS2025.1 | GLO09 |
| 2 | questionable | Identity of a feature cannot be determined using relevant observations and scientific judgment; therefore, one cannot be reasonably confident in the credibility of this interpretation. For example, IdentityConfidence = questionable is appropriate when a geologist reasons "I can see some kind of planar feature that separates map units in this outcrop, but I cannot be certain if it is a contact or a fault." | FGDC-STD-013-2006 | GLO02 |
| 25 | recreational GPS | Data collected using Apple iPad using GIS software such as ESRI Field Maps or IGIS with settings of 30 ft point accuracy. | MGS_DAMAS2025.1 | GLO22 |
| 18 | right lateral fault | A strike-slip fault on which the side opposite the observer has been displaced to the right. Synonym: dextral fault. The Pleasant Grove Fault, which is labeled as a right lateral fault on this map, is interpreted as an older potential thrust fault that has been reactivated as a strike-slip. The older potential thrust fault is referenced by vertical arrows on the cross section. | AGI_2011|MGS_DAMAS2025.1 | GLO15 |
| 26 | sample | Field collected piece or pieces of rock, weathered rock, saprolite, or soil sent for geochemical analysis. | MGS_DAMAS2025.1 | GLO23 |
| 24 | shear zone | A parallel-sided zone of localized shearing displacement, which may be recognized by sigmoidal mineral-filled veins, locally well-developed cleavage or foliation, wholesale grain-size reduction or mylonitization, or some combination of these features. | AGI_2011 | GLO21 |
| 19 | thrust fault | A fault with a dip of 45° or less over much of its extent, on which the hanging wall has moved upward relative to the footwall. | AGI_2011 | GLO16 |