Stratigraphy

Below is a generalized stratigraphic column showing the Marmaton
Group (including the Altamont Formation) in Missouri. For the Altamont
and adjacent strata, this column accurately portrays their stratigraphic
development near the Kansas-Missouri border, but is misleading for the
St. Louis area. For example, the Amoret Limestone Member of the
Altamont is apparently not present at I-170. Also, the Bandera is much
thinner here and includes boulder conglomerate with limestone interbeds
in the upper part rather than sandstone. For a thorough discussion of
these units see the web publication by Dr. Norman R. King entitled
The I-170 Pennsylvanian Exposure in St. Louis, Missouri

Classification of Pennsylvanian strata
exposed along I-170 in St. Louis, MO

Pennsylvanian System
Middle Pennsylvanian Series
Desmoinesian Stage
Marmaton Group
Altamont Formation
Worland Limestone Member
Lake Neosho Shale Member
Amoret Limestone Member (apparently not present at I-170)
Bandera Formation

For a thorough discussion of these units see the web publication
by Dr. Norman R. King
The I-170 Pennsylvanian Exposure in St. Louis, Missouri

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St. Louis Pennsylvanian Fossils of the Altamont Formation