| Table 1. Nomenclature for lithologic units within the field trip area. | |||
| Lithologic Unit |
Descriptive Field Nomenclature1 | General Petrologic Nomenclature2 | Charnockitic Nomenclature3 |
|---|---|---|---|
| Yfqj | low-silica charnockite (5) | monzogranite to quartz monzodiorite | farsundite to quartz jotunite |
| Yaf | alkali feldspar granite4 (4) | ||
| Ygr | Old Rag magmatic suite (3) | alkali feldspar granite to syenogranite | alkali feldspar charnockite to charnockite |
| Ygg | garnetiferous alkali feldspar granite and syenogranite (1) | alkali feldspar granite to syenogranite | |
| Ylgg | leucogranite gneiss (5) | alkali feldspar granite | |
| Ybg | biotite granitoid gneiss (3) | monzogranite to quartz monzonite and quartz monzodiorite | |
| Yfh | Flint Hill Gneiss (1) | syenogranite to monzogranite | |
| Yfpg | foliated pyroxene granite (1) | monzogranite | farsundite |
| Ylgn | layered granodiorite gneiss (1) | granodiorite | opdalite |
| Ypqd | pyroxene quartz diorite (1) | quartz diorite | orthopyroxene quartz diorite |
| Ycf | high-silica charnockite (2) | syenogranite to monzogranite | charnockite to farsundite |
| Yg | garnetiferous granite gneiss (2) | syenogranite to monzogranite | charnockite to farsundite |
| Ygn | garnetiferous gneiss (4) | ||
| Ylg | leucocratic granitoid and foliated megacrystic leucocratic granite (4) | alkali feldspar granite to syenogranite | |
1Number following nomenclature refers to the 7.5-minute quadrangle containing
the reference locality within the area of new mapping: (1) Chester Gap, (2)
Thornton Gap, (3) Old Rag Mountain, (4) Madison, and (5) Fletcher.
2Nomenclature determined using molar normative compositions calculated on basis
of Fe2+/Fe(total) = 0.9 plotted on Q' vs ANOR plot of Streckeisen and Le Maitre
(1979).
3Nomenclature following recommendations of Le Maitre and others (1989).
4Leucocratic rocks are indicated by italics.