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Geological Map of Canada (CD-ROM)
Map D1860A

GIS database structure

Cartographic projection

All of the spatial data in the Arc/Info coverages, and in the *.E00 and *.SHP files is stored in the same projection described by the following set of projection parameters:

**Geological Map of Canada projection parameters**
Parameter	Value
Type	Lambert Conformal Conic projection
Datum	North American Datum 1927 (NAD27)
Units	metres
Spheroid	Clarke, 1866
Lambert standard parallels	49 00 00 N 77 00 00 N
Projection origin	95 00 00 W (central meridian) 49 00 00 N
False origin	(easting, northing)=(0, 0)

The \CANADA\SHPGEO\... *.SHP files contain geographic (longitude, latitude) co-ordinates.

Data sets

The following tables describe the database fields which appear in the Arc/Info workspaces, *.E00 files and .DBF files which accompany the *.SHP files.

The codes used for directory and file names correspond to either the compilation block (ARC, SUP, etc.) and/or data type (ROX, RIV, BND, etc.).

Geological data sets

ROX<area>: geology (polygons and linework)

Geological unit areas are defined as polygons and geological contacts are defined as lines. The following items are attached to each polygon:

**Database fields for ROX polygons**
Field	Description
SYMBOL	symbol number
COMP	compiler's name
English
UNIT	unit code
DOMAIN	onshore/offshore/ice
COUNTRY	country
ERA	age at the era level
PERIOD	age at the period level
EPOCH	age at the epoch or period level
REWORKAG	age of reworking/intense metamorphism
RXTP	general rock category
SUBRXTP	specific rock category if applicable
AGERXTP	age/rock type combination for viewers
METGRADE	metamorphic grade
GEOLPROV	geological province
NAME	unit name
French
UNITE	French equivalent of 'UNIT' field
DOMAINE	French equivalent of 'DOMAIN' field
PAYS	French equivalent of 'COUNTRY' field
ERE	French equivalent of 'ERA' field
PERIODE	French equivalent of 'PERIOD' field
EPOQUE	French equivalent of 'EPOCH' field
AGETRANS	French equivalent of 'REWORKAG' field
TPRCH	French equivalent of 'RXTP' field
SUBTPRCH	French equivalent of 'SUBRXTP' field
AGETPRCH	French equivalent of 'AGERXTP' field
NIVMET	French equivalent of 'METGRADE' field
PROVGEOL	French equivalent of 'GEOLPROV' field
NOM	French equivalent of 'NAME' field

The following items are attached to each line:

**Database fields for ROX arcs**
Field	Description
SYMBOL	a symbol number
COMP	compiler's name
DXF-LAYER	description code (see table below)
English
COUNTRY	country
ENGDESC	detailed English description of line
French
PAYS	French equivalent of 'COUNTRY' field
FREDESC	French equivalent of 'ENGDESC' field

FLT<area>: faults (geological linework, e.g. faults, fracture zone, etc.)

Geological linework, other than geological contacts, are defined as lines, and points are used to define markers or symbology on the lines. The following items are attached to each line and point:

**Database fields for FLT arcs**
Field	Description
SYMBOL	a symbol number
COMP	compiler's name
DXF-LAYER	description code (see table below)
English
COUNTRY	country
ENGDESC	detailed English description of line
NAME	feature name (to be added by user)
French
PAYS	French equivalent of 'COUNTRY' field
FREDESC	French equivalent of 'ENGDESC' field
NOM	French equivalent of 'NAME' field

SYM<area>: geological symbols (e.g. impact structure, volcanic centre, etc.)

The geological symbols on this map are defined as lines and points. The following items are attached to each line and point:

**Database fields for SYM symbols**
Field	Description
SYMBOL	a symbol number
COMP	compiler's name
DXF-LAYER	description code (see table below)
English
COUNTRY	country
ENGDESC	detailed English description of symbol
NAME	feature name (to be added by user)
French
PAYS	French equivalent of 'COUNTRY' field
FREDESC	French equivalent of 'ENGDESC' field
NOM	French equivalent of 'NAME' field

Topographic data sets

RIV<area>: line cover of all lakes and rivers that appear in each area

The topographical data are defined as lines. The following items are attached to each line and point:

**Database fields for RIV arcs**
Field	Description
SYMBOL	a symbol number
DXF-LAYER	description code (see table below)
English
ENGDESC	detailed English description of line
French
FREDESC	French equivalent of 'ENGDESC' field

LAK<area>: polygons of all lakes that appear in each area

The topographical areas are defined as polygons. The following items are attached to each polygon:

**Database fields for LAK polygons**
Field	Description
SYMBOL	a symbol number
DXF-LAYER	description code (see table below)
English
ENGDESC	detailed English description
French
FREDESC	French equivalent of 'ENGDESC' field

BND<area>: line cover of all political boundaries that appear in each area

The topographical data are defined as lines. The following items are attached to each line:

**Database fields for BND arcs**
Field	Description
SYMBOL	a symbol number
DXF-LAYER	description code (see table below)
English
ENGDESC	detailed English description of line
French
FREDESC	French equivalent of 'ENGDESC' field

In addition, the following Canada-wide coverages of topographic data are supplied:

BAS1860A: topographical linework and point symbols of all Canada

The topographical data are defined as lines and points. The following items are attached to each line and point:

**Database fields for BAS1860A arcs and points**
Field	Description
SYMBOL	a symbol number
DXF-LAYER	description code (see table below)
English
ENGDESC	detailed English description
NAME	city name (in point file only)
French
FREDESC	French equivalent of 'ENGDESC' field
NOM	French equivalent of 'NAME' field

WAT1860A: polygons (lakes, oceans, etc.) of all Canada

The topographical areas are defined as polygons for unit areas and lines for shoreline. The following items are attached to each line and polygon:

**Database fields for WAT1860A polygons**
Field	Description
SYMBOL	a symbol number
DXF-LAYER	description code (see table below)
English
ENGDESC	detailed English description
French
FREDESC	French equivalent of 'ENGDESC' field

BUF1860A: buffer polygons around islands and shoreline of all Canada

This special polygon cover is included to create a white band around all shorelines and islands. This helps to separate the onshore geology from the offshore. The polygons use the attribute item 'INSIDE'.

TXT1860A: topographical text of all Canada

The topographical text on this map is defined as annotation. The annotation is stored as a subclass called 'TEXT' which uses the attribute item 'TXT-CLASS'

NOTE:: Covers may be exported in DXF format. Different line and symbol types will be exported as separate AUTOCAD layers by using the 'DXF-LAYER' item.

List of DXF-LAYER codes and descriptions

The following is a list of all DXF-LAYER attributes that appear in the data with a brief description.

Linework

**Values for the DXF-LAYER field**
DXF-LAYER value	Description
UNCLASS_FLT	unclassified fault
UNCLASS_FLT_OFF	unclassified fault offshore
THRUST_FLT	thrust fault (teeth on upper plate)
THRUST_FLT_OFF	thrust fault offshore (teeth on upper plate)
NORMAL_FLT	normal fault (hachures on downthrown side)
NORMAL_FLT_OFF	normal fault offshore
STRIKE_SLIP_FLT	strike slip fault
STRIKE_SLIP_OFF	strike slip fault offshore
SPREAD_CTR	offshore spreading centre
DEFORM_FRONT	offshore deformation front
SEAFLOOR_ISO	seafloor isochron
PSEUDO_FLT	offshore pseudo fault
FRACTURE_ZONE	offshore fracture zone
FLEXURE_FLT	offshore flexure fault
TRANSFORM_FLT	offshore transform fault
EXTINCT_CENTRE	extinct spreading centre
SED_ISOPACH	oceanic sediment isograds (defined)
SED-ISOPACH2	oceanic sediment isograds (assumed)
CONT_OCEAN_BDRY	continent ocean boundary (defined)
CONT_OCEAN_BDRY2	continent ocean boundary (assumed)
FACIES_BDRY	facies boundary
CONTACT	geological contact
OFF_CONTACT	offshore geological contact (inferred)
OTHERS	miscellaneous lines
EVAP_DIAPIR	evaporite diapir
BURIED_CONTACT	buried contact
BURIED_FLT	buried fault
IMPACT	impact structure
FAULT_BDRY	fault boundary
ICE_BDRY	ice boundary

Symbols

**Values for the DXF-LAYER field in SYM coverages**
DXF-LAYER value	Description
VOLCANIC_CENTER	volcanic centre
DIATREME	diatreme
KIMBERLITE	kimberlite
CARBONATITE	carbonatite
TrJ_ULTRAMAFIC	Alaskan-type ultramafic bodies (Triassic Jurassic)
mK_ULTRAMAFIC	Alaskan-type ultramafic bodies (mid-Cretaceous)
EVAP_DIAPIR	evaporite diapir
ACC_TERRANE	leading edge of accreted terrane

Base

DXF-LAYER Value	Description
NEATLINE	neatline
URBAN_BDRY	urban boundary
UNSURVEY_BDRY	unsurveyed boundary
DIST_BDRY	district boundary
PROV_BDRY	provincial boundary
INT_BDRY	international boundary
CITY_NAME	city name
SHORELINE	shoreline
LAKE	lake
RIVER	river
ARC_CIRCLE	arctic circle
BATHYMETRY	submarine contour
ISLAND	island