Name provisionally used pending approval of use of "intrusive suite" by American Commission on Stratigraphic Nomenclature. Generalized stratigraphic column (p. 2 of volume) of St. Francois Mountains (presumably for which unit is named) located in southeast MO, Midcontinent region, shows intrusive suite to include diabase and gabbro dikes and sills and granite, adamellite, syenite, diorite and granite porphyry stocks, bosses, plutons and sheet-like intrusive bodies. Younger than St. Francois Mountains Supergroup (first used). [Same geographic names should not be used for different units]. Underlies Lamotte Sandstone. Precambrian Y [Middle Proterozoic] age.

Source: GNU records (USGS DDS-6; Denver GNULEX).

/St. Francois Mountains Intrusive Suite [not to be confused with /St. Francois Mountains Volcanic Supergroup]. Divided into hypabyssal and plutonic rock units. Hypabyssal units are (oldest to youngest) Brown Mountain Rhyolite Porphyry, Carver Creek Granite Porphyry, Munger Granite Porphyry and Buford Granite Porphyry. Plutonic units are (oldest to youngest) "Butler Hill-Breadtray Granites," "Slabtown-Stono Granites," "Silvermine-Knoblick Granites," and Graniteville Granite. Study area is St. Francois Mountains, southeast Missouri (Midcontinent region). Age is Precambrian Y. Nomenclature listed in table 1.
[Conflicts with nomenclature guidelines (ACSN, 1970; NACSN, 1983, 2005, 2021): name St. Francois Mountains applied concurrently to two different units in same area; a [supergroup] name combines a geographic name with the term ["supergroup,"] and no lithic designation is included; name Butler Hill applied concurrently to two different units in same area.]

Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).