Legend (geology/northamerica_gmna)

Geologic overprints (0) Continental deposits Melange Metamorphic rocks Offshelf deposits Bathymetry (1) Contour Depression Contour Drainage (2) Open water (3) Volcanoes (4) Cinder cone or lava dome Volcano Calderas (5) Glaciation extents (6) Limit of pre-Wisconsin glaciation Limit of Wisconsin glaciation Impact structures GT 10 km in diameter (7) Impact structures LT 10km in diameter (8) Diapirs (9) Dome < 10km in diameter Dome > 10km in diameter Areas of abundant diapiric structures (10) Diapiric structure trends (11) Small bodies of unusual igneous rocks (12) Alaskan type ultramafic body Alkaline complex Carbonatite Diatreme Kimberlite Polymetallic sulfide deposits (13) Hydrothermal vents (14) Gas/oil seep (15) Gas/fluid seep (16) Rock in seafloor sample (17) Felsic Granite Ultramafic Maganiferous deposits (18) Blocks, slabs, and pavements Crusts Crusts and nodules Crusts, blocks, slabs, and pavements Crusts, nodules, blocks, slabs, and pavements Nodules Nodules, blocks, slabs, and pavements Undifferentiated Phosphate nodules or pavement (19) Dikes and sills (20) Cretaceous-Tertiary dikes Early Cretaceous dikes Early Proterozoic mafic dikes (1800-1600 Ma) Early Proterozoic mafic dikes (2100-1800 Ma) Early Proterozoic mafic dikes (2200-1800 Ma) Early Proterozoic mafic dikes (2500-2100 Ma) Late Proterozoic mafic dikes Mid-Cretaceous dikes Middle Archean mafic dikes Middle Proterozoic dikes (1350-1120 Ma) Middle Proterozoic mafic dikes (1200-1000 Ma) Middle Proterozoic mafic dikes and sills (1450-1200 Ma) Tertiary dikes Triassic and Jurassic dikes and sills Geologic contacts (21) Location accurate Location approximate Location concealed Faults (22) Growth fault Normal fault - Location accurate Normal fault - Location approximate Normal fault - Location concealed Strike-slip fault - Location accurate Strike-slip fault - Location approximate Strike-slip fault - Location concealed Thrust fault - Location accurate Thrust fault - Location approximate Thrust fault - Location concealed Unclassified fault - Location accurate Unclassified fault - Location approximate Unclassified fault - Location concealed Special submarine line features (23) Axis of sediment drift Axis of submarine canyon, sea valley, or channel - Location accurate Axis of submarine canyon, sea valley, or channel - Location approximate Fossil subduction zone - Location accurate Fossil subduction zone - Location approximate Frontal thrust fault of active accretionary wedge - Location accurate Frontal thrust fault of active accretionary wedge - Location approximate Isochron in oceanic crust - Basement exposed Isochron in oceanic crust - Basement inferred Isochron in oceanic crust - Basement not exposed Pseudofault in oceanic crust Shear zone - Diffuse Slump scar or growth fault - Location accurate Slump scar or growth fault - Location approximate Spreading center or overlapping spreading center - Active Spreading center or overlapping spreading center -Abandoned Submarine escarpment Transform fault, or non-transform offset of spreading center - Active Transform fault, or non-transform offset of spreading center - Inactive or concealed Geologic units (24) 1eT 1lK 1lP 1lPA 1lPA* 1uK 1uP 1uPA 2eT 2lK 2lP 2lPA 2uK 2uKvb 2uKvi 2uP 2uPA 3eT <Null> ?J* ?Jv* ?Jvm* ?K* ?KT* ?KpgTv* ?PZ* ?Qvm* ?Qvm** ?T* ?TR* ?Tv* ?Tvm?* ?Yg* ?lKvmk* ?mTv ?mTv* ?mTvb* ?mTvm* ?mTvmk ?mTvmk* ?mTvmk?* ?nTQv* ?nTQvmk* ?nTv* ?oTv* ?oTvmk* ?oTvmk?* ?plTvm* ?plTvm** ?uKv* ?uKvm* Ag Agn An Asvn At Avm CA CA* CAD CAD* CADsv CADv CAJ CAM CAO CAO* CAOg CAOm CAOsgn CAOsn CAOsv CAOu CAOv CAOvm CAS CAS* CASq CAk CAv CAvf CAvm D D* DJvm DK DKvm DM DM* DMi DMn DMq DMsv DMv DMvk DMy DP DPA DPA* DPAq DPAsv DPAvb DPsv DPv DPvm DTR DTRm DTRsv DTRsvm DTRu DTRvm Dg Dg* Dgn Di Dm Dmu Dq Dsv Dv Dvf Dvm Dy IS* Ice J J* JK JK* JK? JKg JKgn JKi JKm JKq JKsv JKsv* JKv JKvf* JKvfi JKvi JKvim JKvm JKx Jg Ji Jim Jm Jmu Jsv Ju Jv Jvf Jvi Jvm Jvm* K K* KQsv** KT KT* KTf KTg KTgn KTi KTm KTsv KTsv* KTt KTv KTv* KTv?* KTvf KTvf* KTvi KTvi* KTvm KTvm* KTx* KTx?* Kg Kg* Ki Km Kmy KpgT* KpgTv* Ksv Ku Kv Kv* Kv?* Kvf Kvi Kvm Kvm* Kx* Ky M M* MJ MJsvm MJvm MKsv MP MP* MPA MPA* MPAg MPAq MPAsv MPm MPsvm MPu MPv MPvm MTR MTRu MTRvm MZ MZ* MZT* MZg MZg* MZn MZsv MZsv* MZx MZx* Msv Mv Mvb O O* OD OD* ODg ODgn ODsv ODv ODy OJsv OJsv* OM OS OS* OSg OSgn OSi OSm OSn OSsv OSu OSv OSvf OSvm OTR OTRsv OTRv Og Ogn Om Oq Osv Ou Ovb Ovf Ovi Ovm P P* PA PA* PAP PAPi PAPm PAPsv PAPv PAPy PATR PATRsv PAvm PJ PJsv PK PKv PRPZ* PRPZx* PRgn PTR PTRg PTRsv PTRvim PTRvm PZ PZ* PZMZ PZMZ* PZMZsv PZMZu PZMZx* PZTRm PZg PZm PZn PZq PZsv PZvf PZvi PZvm PZx PZx* Pg Pi Pm Pq Psv Pt Pu Pv Pvm Q Q* Qv Qv* Qvf Qvf* Qvfi Qvfi* Qvi Qvi* Qvim Qvim* Qvm Qvm* Qvm** Qvm?** Qvmk Qvmk* Qvmk?* Qvmkf* S S* SD SD* SDg SDm SDmy SDv SDvm SM SM* Sfm Sg Sm Sq Ssv Sv Svf Svi Sy T T* TKi TQ TQ* TQsv** TQv TQv* TQvb TQvbk TQvf TQvi TQvim TQvk TQvm TQvm* TQvmk* TR TR* TRJ TRJ* TRJg TRJi TRJm TRJq TRJsv TRJv TRJvi TRJvk TRJvm TRJy TRK TRg TRi TRm TRq TRsv TRu TRv TRvb TRvi TRvk TRvm Tg Ti Tv Tv* Tv?* Tvf Tvi Tvim* Tvm Tvm* UWn Ugn Un Usv Ut VWn VWn* VWsv Vn W WX WXa WXg WXgn WXm WXn WXsv WXsv* WXv Wa Wg Wgg Wgn Wgt Wi Wk Wm Wma Wn Wq Wqs Wsgn Wsn Wsv Wsvk Wsvm Wt Wtn Wv Wvf Wvfi Wvi Wvm Wvn Wy Wyn X X* XCAn XY XYc XYg XY¹n Xg Xi Xm Xn Xq Xqz Xsn Xsv Xsvn Xvf X² X²cs X²g X²g* X²gn X²m X²n X²q X²sn X²sv X²u X²v X²vb X²vf X²vk X²vm X²vm* X²y X²³ X³ X³Ya X³Yc X³Yn X³Y¹ X³Y¹g X³Y¹gn X³Y¹m X³Y¹mn X³Y¹n X³Y¹sn X³a X³g X³gn X³m X³mn X³n X³q X³qz X³r X³v X³vb X³vf X³y X¹ X¹g X¹m X¹ma X¹v X¹y X¹² X¹²sn X¹²v X¹²vb X¹²vm Y YZ YZ* YZn Ya Yc Yg Yg* Ygn Ym Yn Yq Ysn Yvf Yy Y² Y²a Y²c Y²g Y²gn Y²k Y²m Y²mb Y²mu Y²n Y²sn Y²sv Y²t Y²v Y²vk Y²vm Y²vm* Y²y Y²³ Y²³gn Y²³y Y³ Y³* Y³Y¹n Y³Z Y³Z* Y³a Y³c Y³g Y³gn Y³k Y³m Y³q Y³sv Y³vm Y³vm* Y³y Y¹ Y¹a Y¹g Y¹gn Y¹m Y¹ma Y¹n Y¹svn Y¹y Y¹yn Y¹² Y¹²sn Z Z* ZCA ZCA* ZCAg ZCAm ZCAn ZCAq ZCAsv ZCAv ZCAvb ZCAvf ZCAvm ZD ZD* ZDn ZDsv ZDvm ZO ZOvm ZPZ ZPZ* ZPZn ZPZsv ZS ZSn ZTR ZTRvm Zg Zgn Zi Zm Zm* Zma Zn Zq Zsv Zv Zvb Zvb* Zvf Zvm Zy d eKg eKg* eKi eKm eT eT* eTg eTi eTk eTm eTq eTsv eTsv* eTv eTv* eTvf eTvf* eTvi eTvim eTvk eTvm eTvm* eoT eoT* eoTk eoTm eoTsv eoTvb eoTvf eoTvi eoTvm eoTvmk eoTy g gn lD lD* lJ lJi lJm lJq lJsv lJv lJvb lJvi lK lK* lKb lKfi lKg lKgn lKi lKm lKq lKsv lKv lKvf lKvi lKvi* lKvm lKvm* lKvmk* lKvmk?* lKvmkf* lKy lM lM* lO lO* lP lPA lS lS* lmD lmD* lmJ lmJ* lmJv lmJvb lmJvi luK* mCA mD mD* mDcb mDe mJi mJm mJq mJy mKgn mKi mKi* mKm mKq mKv mKy mO mO* mT mT* mT?* mTg mTi mTm mTq mTsv mTv mTv* mTvb mTvb* mTvf mTvf* mTvfi mTvfi* mTvi mTvi* mTvim mTvm mTvm* mTvmk* mTvmk?* mTvmkf* mTvmki* mTx* mlJi mlJm mlJq mlJt muD muO muO* n nT nT* nTQ nTQ* nTQv* nTQvb* nTQvm nTQvm* nTQvm** nTQvmk* nTf nTg nTi nTsv nTv nTv* nTvb* nTvb?* nTvf nTvfi nTvi nTvi* nTvim nTvk nTvm nTvm** nTvm?* nTvmk* nTy oT oT* oTm oTq oTsv oTsv* oTv oTv* oTvb* oTvf oTvf* oTvi oTvm oTvm* oTvmk* oTvmkf* omT omT* omTf omTi omTk omTm omTq omTsv omTv omTvf omTvfi omTvi omTvim omTvm omTvmkf* pCA* pCAq pCAx pCAx* pCZ* pCZx* pKx pKx* pMZx pQ paT paT* paTsv paTv* paTvf paTvm* pgT pgT* pgTf pgTg pgTgn pgTi pgTm pgTmy pgTq pgTsv pgTsv* pgTsvm* pgTv pgTv* pgTv?* pgTvb pgTvf pgTvf* pgTvi pgTvk pgTvm pgTvm* pgTx* pgTy plT plT* plTQ plTQ* plTQv* plTQvb* plTQvf plTQvf* plTQvi plTQvi* plTQvim plTQvm plTQvm* plTQvm** plTQvmk* plTsv plTsvm* plTv* plTvf plTvi plTvm plTvm* plTvm** plTvmkf* u u* uCA uD uD* uDcb uDvb uJ uJ* uK uK* uKpgT* uKpgTv* uKsv uKsv* uKv uKv* uKvbk uKvf uKvi uKvm uKvm* uKvmk* uKvmk?* uKvmkf?* uM uM* uO uO* uP uPA x* <all other values>