| 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 |
|---|---|---|
| CZib | X | X |
| CZmbcq | X | X |
| Qal | X | X |
| CZmg | X | X |
| CZmb | X | X |
| CZmgs | X | X |
| CZmbg | X | X |
| CZmbcp | X | X |
| Trtm | X | X |
| Trmp | X | X |
| CZmbb | X | X |
| CZum | X | X |
| water | X | X |
| Trmr | X | X |
| CZi | X | X |
| CZiq | X | X |
| CZmbq | X | X |
| Jd | X | X |
| CZicq | X | X |
| OBJECTID | Source | Notes | URL | DataSources_ID |
|---|---|---|---|---|
| 5 | 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 |
| 4 | 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 |
| 3 | 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 |
| 13 | Dingman, R.J., Meyer, G., and Martin, R.O.R., 1954 | Dingman, R.J., Meyer, G., and Martin, R.O.R., 1954. The water resources of Howard and Montgomery Counties: Maryland Department of Geology, Mines, and Water Resources, Bulletin 14, 260 p. | http://www.mgs.md.gov/publications/report_pages/BULL_14.html | MGS_Bull_14 |
| 20 | 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 |
| 1 | Kavage Adams, 2025 | Kavage Adams, R., 2025. Geologic Map of the Germantown Quadrangle, Montgomery County, Maryland. Maryland Geological Survey, Quadrangle Geologic Map, GERMA2025.1, scale 1:24,000. | http://www.mgs.md.gov/publications/maps.html | MGS_GERMA2025.1 |
| 12 | Cloos and Cooke, 1953 | Cloos, E., and Cooke, C.W., 1953. Geologic map of Montgomery County [Maryland] and the District of Columbia: Maryland Department of Geology, Mines and Water Resources, scale 1:62,500. | http://jhir.library.jhu.edu/handle/1774.2/34596 | MGS_MODC1953 |
| 17 | Nutter, L.J., 1975 | Nutter, L.J., 1975, Hydrogeology of the Triassic rocks of Maryland: Maryland Geological Survey Report of Investigations No. 26, 37 p. | http://www.mgs.md.gov/publications/report_pages/RI_26.html | MGS_RI_26 |
| 7 | Kavage Adams, R., field observations | field observations and interpretations by Rebecca Kavage Adams of the Maryland Geological Survey | None | MGS_RKA |
| 19 | 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 |
| 6 | National Hydrography Dataset | U.S. Geological Survey, 2020, National Hydrography Dataset (NHD), accessed August 2023 at https://www.usgs.gov/national-hydrography/national-hydrography-dataset | https://www.usgs.gov/national-hydrography/national-hydrography-dataset | NHD_2020 |
| 9 | Smoot and Robinson Jr., 1988 | Smoot, J.P., and Robinson, G.R. Jr., 1988. Base- and precious-metal occurrences in the Culpeper Basin, Northern Virginia, IN Froelich, A.J., and Robinson, G.R., Jr., eds., Studies of the early Mesozoic basins of the Eastern United States: U.S. Geological Survey Bulletin, Geology of the early Mesozoic basins of eastern North America, Reston, VA, May 11-14, 1987, 1776, p. 403-423. | https://pubs.usgs.gov/publication/b1776 | USGS_Bull_1776_403 |
| 21 | Gottfried and Froelich, 1985 | Gottfried, D., and Froelich, A.J., 1985. Geochemical and petrologic features of some Mesozoic diabase sheets in the Northern Culpeper Basin, IN Robinson, G.R., Jr., and Froelich, A.J., eds., Proceedings of the Second U.S. Geological Survey Workshop on the early Mesozoic basins of the eastern United States, U.S. Geological Survey Circular 946, Reston, VA, November 14-16, 1984, p. 86-91. | https://pubs.usgs.gov/publication/cir946 | USGS_CIR_946 |
| 22 | Southworth, 1998 | Southworth, C.S., 1998. Geologic map of the Poolesville quadrangle, Frederick and Montgomery Counties, Maryland, and Loudoun County, Virginia: U.S. Geological Survey Geologic Quadrangle Map GQ-1761, scale 1:24,000. | https://pubs.usgs.gov/publication/gq1761 | USGS_GQ_1761 |
| 23 | Southworth, 1999 | Southworth, C.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 |
| 24 | Drake et al., 1999 | Drake, A.A., Southworth, C.S., and Lee, K.Y., 1999. Geologic map of the Seneca quadrangle, Montgomery County, Maryland, and Fairfax and Loudoun Counties, Virginia: U.S. Geological Survey Geologic Quadrangle Map GQ-1802, scale 1:24,000. | https://pubs.usgs.gov/publication/gq1802 | USGS_GQ_1802 |
| 18 | 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 |
| 8 | Southworth, C.S., field observations | field observations and interpretations by Scott Southworth of the United States Geological Survey | None | USGS_ScottSouthworth |
| 16 | Southworth et al., 2008 | Southworth, C.S., Brezinski, D.K., Drake, A.A., Burton, W.C., Orndorff, R.C., Froelich, A.J., Reddy, J.E., Denenny, Danielle, 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-288 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | water | water | water | None | None | 01-01 | DMU Unit 2 | None | 30.02.29 | 204,255,255 | None | None | Water or ice | High | DMU01 |
| 2 | Qal | Alluvium | Alluvium | Quaternary | Poorly- to well-sorted, stratified mixtures of unconsolidated clay, silt, sand, gravel, and cobbles underlying floodplains of nearly all rivers and tributaries. Channels of tributaries are commonly incised into bedrock with alluvium covering exposed along the banks. Thickness of alluvium is highly variable, and is a function of bedrock, topography, and land-use practices. Thick deposits of alluvium are present where eroded sediment, due to agricultural practices of the 19th century and recent suburban development, has accumulated (Southworth et al., 2008). Buildups of eroded sediment also occur above historic mill dams. | 01-02 | DMU Unit 1 | Qal | 40 | 255,255,179 | None | MGS_GERMA2025.1|USGS_SIM_2889_FREDERICK | Alluvial sediment | High | DMU02 |
| 3 | Jd | Diabase dikes and sills | Diabase dikes and sills | Jurassic | Medium to dark gray, medium-grained, equigranular, massive diabase that weathers to characteristic rounded boulders with a rusty orange-brown surface. The Boyds sheet is saucer-shaped and fine-grained at the margin (Gottfried and Froelich, 1985). Linear dike southwest of Germantown is largely concealed by recent suburban development. Dikes are mapped on presence of rounded boulders and location on previous geologic maps (Cloos and Cooke, 1953 and Froelich, 1975). | 02-01 | DMU Unit 1 | Jd | 99 | 255,000,000 | None | MGS_GERMA2025.1|MGS_MODC1953|USGS_IMAP920_MO1975 | Coarse-grained, mafic-composition intrusive igneous rock | High | DMU03 |
| 4 | Trtm | Thermally metamorphosed rocks | Thermally metamorphosed rocks | Triassic | Includes dusky blue to medium dark gray cordierite-spotted hornfels; grayish red meta-arkose, and pale pink to medium gray meta-conglomerate occuring as zoned contact aureole adjacent to diabase sill. | 02-02 | DMU Unit 1 | ^tm | 178 | 235,077,102 | None | MGS_GERMA2025.1 | Contact-metamorphic rock | High | DMU04 |
| 5 | None | Manassas Sandstone | Manassas Sandstone | None | None | 03 | DMU-Heading1 | None | None | None | None | MGS_GERMA2025.1 | Mostly sandstone | High | DMU05 |
| 6 | Trmp | Poolesville Member | Manassas Sandstone, Poolesville Member | Triassic | Gray, grayish red, and reddish brown, fine- to coarse-grained, thick-bedded, arkosic, micaceous sandstone. Crossbeds and conglomeratic channel lags are present. Interbedded with reddish brown, thin-bedded, calcareous siltstone in fining-upward fluvial sequences. Thickness in Germantown area is estimated at 1700 ft (520 m). Contact with the underlying Reston Member is gradational. | 03-01 | DMU Unit 1 | ^mp | 511 | 153,235,235 | None | MGS_GERMA2025.1 | Mostly sandstone | High | DMU06 |
| 7 | Trmr | Reston Member | Manassas Sandstone, Reston Member | Triassic | Light gray to grayish red and grayish pink conglomerate containing well-rounded to subrounded clasts of phyllite, schist, quartzite, metagraywacke, and quartz in a poorly-sorted, coarse-grained, arkosic sandstone matrix. Locally interbedded with pale reddish brown sandstone and siltstone. Clast angularity increases where basal conglomerate unconformably overlies metasedimentary rocks of the Marburg Formation along Great Seneca Creek. Thickness varies from approximately 20 to 250 feet (7-75 m). | 03-02 | DMU Unit 1 | ^mr | 715 | 102,153,235 | None | MGS_GERMA2025.1 | Mostly sandstone | High | DMU07 |
| 8 | None | Ijamsville Phyllite | Ijamsville Phyllite | Proterozoic-Cambrian | Grayish purple to grayish blue phyllite with minor slate and bodies of metabasalt, quartzite, and conglomerate. Four lithologies are mapped on the Germantown Quadrangle. | 04 | DMU-Heading1 | None | None | None | None | MGS_GERMA2025.1 | Metamorphic rock | High | DMU08 |
| 9 | 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 phyllonite with abundant folded micaceous quartz veins and epidote deposits is present near Barnesville-Monrovia Fault and Hyattstown Fault. Faults are mapped along NE-SW trending ridges on Route 109 and Peach Tree Ridge Road. Shear zone around faults is marked with wavy lines as shown in lower half of symbol. | 04-01 | DMU Unit 1 | _Zi | 312 | 204,222,235 | 705-K symbology in zones of phyllonitic alteration. | MGS_GERMA2025.1 | Meta-felsic and intermediate rock | High | DMU09 |
| 10 | CZib | metabasalt | Ijamsville Phyllite, metabasalt | Proterozoic-Cambrian | Greenish gray to dark greenish gray, schistose metabasalt. A small body is mapped in the northwest corner of the quadrangle along the Little Monocacy River and another mapped north of Comus is based on float. | 04-02 | DMU Unit 1 | _Zib | 466 | 179,128,128 | None | MGS_GERMA2025.1 | Meta-mafic rock | High | DMU10 |
| 11 | CZiq | quartzite | Ijamsville Phyllite, quartzite | Proterozoic-Cambrian | Yellowish gray to olive green, fine- to medium-grained, massive quartzite locally intervening between phyllite and metabasalt. One body is mapped in the northwest corner of the quadrangle. | 04-03 | DMU Unit 1 | _Ziq | 478 | 179,077,102 | None | MGS_GERMA2025.1 | Quartzite | High | DMU11 |
| 12 | CZicq | conglomeratic quartzite | Ijamsville Phyllite, conglomeratic quartzite | Proterozoic-Cambrian | Greenish gray, medium- to coarse-grained conglomerate with glassy quartz pebbles and medium light gray phyllite chips. One small body is mapped north of Comus and is based on float. | 04-04 | DMU Unit 1 | _Zicq | 476 | 179,128,102 | None | MGS_GERMA2025.1 | Metasedimentary rock | High | DMU12 |
| 13 | None | Marburg Formation | Marburg Formation | Proterozoic-Cambrian | Light to dark olive gray phyllite and metasiltstone with bodies of metagraywacke, metabasalt, quartzite, and chloritic phyllite. Six lithologies are mapped on the Germantown Quadrangle. | 05 | DMU-Heading1 | None | None | None | None | MGS_GERMA2025.1 | Metamorphic rock | High | DMU13 |
| 14 | CZmb | Marburg Formation, undifferentiated | Marburg Formation, undifferentiated | Proterozoic-Cambrian | Dark greenish gray to light olive gray, phyllitic metasiltstone containing thin, light gray, quartz laminae and ribbons; medium purplish gray to very pale orange, muscovite phyllite similar to that of the Ijamsville Phyllite with occasional siderite pseudomorphs after pyrite. Much of the unit is transposed, phyllonitized, and has abundant pods of white vein quartz with deposits of chlorite and epidote. Shear zone around fault is marked with wavy lines as shown in lower half of symbol. | 05-01 | DMU Unit 1 | _Zmb | 244 | 222,179,179 | 705-K symbology in zones of phyllonitic alteration. | MGS_GERMA2025.1 | Metasedimentary rock | High | DMU14 |
| 15 | CZmbq | quartzite | Marburg Formation, quartzite | Proterozoic-Cambrian | Light to medium bluish gray and light olive gray, coarse-grained, blocky to massive quartzite. Mapped south of Little Seneca Lake and along Bucklodge Branch. | 05-02 | DMU Unit 1 | _Zmbq | 404 | 179,179,255 | None | MGS_GERMA2025.1 | Quartzite | High | DMU15 |
| 16 | CZmbg | metagraywacke | Marburg Formation, metagraywacke | Proterozoic-Cambrian | Grayish green to black, schistose, blocky-weathering metagraywacke interbedded with dark gray phyllite. Mapped south of Little Seneca Lake and along Great Seneca Creek. | 05-03 | DMU Unit 1 | _Zmbg | 304 | 204,179,235 | None | MGS_GERMA2025.1 | Metasedimentary rock | Medium | DMU16 |
| 17 | CZmbcp | chlorite phyllonite | Marburg Formation, chlorite phyllonite | Proterozoic-Cambrian | Greenish gray, chlorite-sericite phyllite containing white vein quartz. Highly folded and sheared with abundant deformed quartz veins. It is mapped north of Great Seneca Creek on the western border of the Pleasant Grove Fault. | 05-04 | DMU Unit 1 | _Zmbcp | 584 | 153,179,077 | None | MGS_GERMA2025.1 | Deformation-related metamorphic rock | High | DMU17 |
| 18 | CZmbb | metabasalt | Marburg Formation, metabasalt | Proterozoic-Cambrian | Grayish-green, aphanitic metabasalt. One small body mapped along a tributary to Bucklodge Branch.. | 05-05 | DMU Unit 1 | _Zmbb | 765 | 102,153,128 | None | MGS_GERMA2025.1 | Meta-mafic rock | Medium | DMU18 |
| 19 | CZmbcq | conglomeratic quartzite | Marburg Formation, conglomeratic quartzite | Proterozoic-Cambrian | Glassy, subangular, quartz pebbles, yellowish gray shale chips, and occasional euhedral magnetite grains (5 cm) in greenish gray matrix. Weathers moderate yellowish-brown, blocky to massive. | 05-06 | DMU Unit 1 | _Zmbcq | 475 | 179,153,102 | None | MGS_GERMA2025.1 | Quartzite | High | DMU19 |
| 20 | None | Mather Gorge Formation | Mather Gorge Formation | Proterozoic-Cambrian | Olive green to dark greenish gray schist and metagraywacke with bodies of metagabbro and serpentinite. Three lithologies are mapped on the Germantown Quadrangle. | 06 | DMU-Heading1 | None | None | None | None | MGS_GERMA2025.1 | Metamorphic rock | High | DMU20 |
| 21 | CZmg | Mather Gorge Formation, undifferentiated | Mather Gorge Formation, undifferentiated | 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. | 06-01 | DMU Unit 1 | _Zmg | 185 | 235,153,077 | None | MGS_GERMA2025.1 | Metasedimentary rock | High | DMU21 |
| 22 | 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; lithologically is similar to CZmg. | 06-02 | DMU Unit 1 | _Zmgs | 184 | 235,179,077 | None | MGS_GERMA2025.1|NEGEOENV_v17_151|MGS_FINKS1994 | Deformation-related metamorphic rock | High | DMU22 |
| 23 | 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. Grayish green to black, fine- to medium-grained serpentinite weathers to a rounded, soft, light gray surface. Very light gray to dark greenish gray actinolite-tremolite-chlorite schist often contains euhedral bladed crystals from 0.1 to 0.4 inch (3 mm to 1cm) in length. 0.1 to 0.2 inch (3 to 5 mm) euhedral magnetite grains occur in abundance within the serpentinite and magnesian schist. Very light gray and dark gray to black, medium- to coarse-grained metagabbro is comprised of plagioclase feldspar, hornblende, epidote, can have a speckled appearance, and weathers blocky. | 07 | DMU Unit 1 | _Zum | 442 | 179,222,179 | None | MGS_GERMA2025.1 | Meta-ultramafic rock | High | DMU23 |
| OBJECTID | Term | Definition | DefinitionSourceID | Glossary_ID |
|---|---|---|---|---|
| 9 | 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 | GLO09 |
| 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 |
| 10 | 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 | GLO10 |
| 8 | contact | A plane or irregular surface between two different types or ages of rock, sediment or other geologic and stratigraphic units. | AGI_2011 | GLO08 |
| 7 | cross section | 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 | GLO07 |
| 6 | DMU-Heading1 | Header for non-MapUnit labels, bolded title, 11pt Times New Roman font. This format is used for formal units that are now shown on the map. | MGS_GERMA2025.1 | GLO06 |
| 5 | DMU Unit 1 | Formation style, bolded title, 11pt Times New Roman font. This format is used for largest unit descriptions where units are not shown on map unit. Units mapped at the surface, and may or may not contain subunits. | MGS_GERMA2025.1 | GLO05 |
| 23 | DMU Unit 2 | Water in DMU Table - shown in Explanation of Map Symbols table on PDF map. | MGS_GERMA2025.1 | GLO19 |
| 13 | fault | A discrete surface or zone of discrete surfaces separating two rock masses across which one mass has slid past the other. | AGI_2011 | GLO13 |
| 17 | fold | A curve or bend of a planar structure such as rock strata, bedding places, foliation, or cleavage. | MGS_GERMA2025.1 | GLO17 |
| 11 | 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 | GLO11 |
| 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 |
| 14 | joint | A planar fracture, crack, or parting in a rock, without shear displacement. | AGI_2011 | GLO14 |
| 12 | 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 | GLO12 |
| 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 |
| 15 | neatline | Map Outline | MGS_GERMA2025.1 | GLO15 |
| 16 | phyllonitic alteration | A zone that macroscopically resembles phyllite but that is formed by mechanical degradation (mylonization) of initially coarser rocks. Characteristic features are silky films of recrystallized mica or chlorite, smeared out along schistosity surfaces; and formation by dislocation metamorphism. | AGI_2011|MGS_GERMA2025.1 | GLO16 |
| 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 |
| 24 | recreational GPS | Field-based method to collect data observations. Collected using tablet and usually 30 ft accuracy confidence. | MGS_GERMA2025.1 | GLO20 |
| 18 | waterline | Line denoting boundary of perrenial natural or manmade areas of surface water of adequate size to map, including streams, rivers, lakes, impoundments. | MGS_GERMA2025.1 | GLO18 |