This feature class represents metamorphic isograds. These lines bound areas of similar metamorphic grades and mineral assemblages that are portrayed by Metamorphic_poly.
| Field Name | Field Alias | Length (text fields) |
Field Type | Field Value | Default | Allow Nulls? | Attributes / Examples | Description / Notes |
|---|---|---|---|---|---|---|---|---|
| FGDC_code | " | 16 | String | variable | [null] | TRUE | 30.3.12 | FGDC geologic symbol reference number. |
| IsgrdClass | IsogradClass | 24 | String | variable | [null] | TRUE | unspecified, prograde, retrograde, etc. | Class of isograd. |
| IDmethod | " | 50 | String | CVD | [null] | TRUE | see: IDmethod | The basis for identification of this feature. |
| Confidence | " | 16 | String | CVD | [null] | TRUE | unspecified, certain, probable, uncertain | Confidence regarding the existence/identification of this feature. |
| Name | " | 50 | String | variable | [null] | TRUE | Second-sillimanite isograd | Feature name (will generally be NULL) |
| Reaction | " | 255 | String | variable | [null] | TRUE | Muscovite + Sio2 -> Kspar + Sil | reactions that produce this assemblage |
| DsplyScale | DisplayScale | Long Integer | CVD | 24000 | TRUE | see: DisplayScale | Denominator of display scale: display feature at scales larger than number specified (=< denominator). Zero indicates data that should never be displayed. | |
| SourceID | " | 128 | String | variable | [null] | TRUE | unknown; unspecified; Smith, 2006b [variable] | Feature level metadata (who mapped this); related to bibliographic detail |
| Comments | " | 255 | String | variable | [null] | TRUE | Free text e.g. "identified from detailed stereo photos" | Comments about this particular feature. |