5 Talladega Slate Belt Composed primarily of low-grade metamorphic rocks Bounded to the Northwest by a foreland fold and thrust fault system known as the Talladega fault or the Columbiana faultTo the southeast is marked by high grade metamorphism caused by both the Hollins Line fault and the Goodwater-Enitachopco fault system.
6 Talladega Slate Belt Alleghanian thrust sheet Metamorphosed to lower green schist facies during the Acadian orogeny and thrust above the foreland fold and thrust belt.Believed to be associated with main pulse of Early to Middle Devonian Acadian orogeny.
7 Sequences Composed of 4 lithologic groups Hillabee Greenstone Sylacauga MarbleTalladegaKahatchee Mountain
8 Hillabee Greenstone 2.6 kilometers thick Ordovician Age 457m.y. Greenstones and GreenschistsWhat is a greenstone?Bulk of sequenceAlbite, Actinolite, Epidote, Zoisite, Clinozoisite, and ChloriteTabular and extrusive
9 Sylacauga Marble Jumbo Dolomite at base Dolomite and Calcite marbles Nature of DolomiteNature and use of marble
10 Sylacauga Marble Below Lay Dam Formation of Talladega Group Unconformity between the twoDiamictitesWhat is diamictite?Lack of fossils make age correlation difficultCambrian to Ordovician
11 Talladega Group Clastic Divided into several formations Lay Dam FormationCheaha Quartzite MemberErin Slate MemberButting Ram SandstoneJemison Chert
12 Lay Dam Formation Overlies Sylacauga Oldest Silurian to Lower Devonian.Greenish-gray, slightly calcareous sericite phyllites and slatesSandstone bodies small, grade into phyllitesRapid deposition.
13 Cheaha Quartzite Member Metasandstone in Lay Dam FormationSandy phyllites and coarse grained quartzitesFines upwardDevonianPrimary StructuresHorizontally bedded, graded intervalsLow angle pebbles structuresChannel fill depositsTabular and trough bedding
14 Erin Slate Member Also member of Lay Dam Formation Thick highly carbonaceous phyllites or slateLess mature than Cheaha Quartzite memberLagoon depositional environment
15 Butting Ram Sandstone Thin green chloritic, arkosic metasandstone Subrounded to rounded quartz sandFeldspathicTidal channel depositsVery discontinuousPoints of elevated crests
16 Jemison Chert Interval Above Butting Ram SandstoneInterbedded white, paper thin quartzitesIntercalated with black graphitic phyllites of Erin SlateWhite to pale light gray, very dense, very fined quartziteComplexly foldedIntense deformationLower Devonian
17 Kahatchee Mountain Group Named Mountain Group because it can be found in the mountains northwest of Syllacuaga.Width is highly variable.Carboniferous in age. (Spores found that indicate carboniferous in metamorphic frontblock of sequence)
18 Formations within the Kahatchee Mountain Group Waxahatchee SlateBrewer PhylliteWash Creek SlateSawyer Limestone*Chilton Fault
19 Deformational Phase 1 – D1 F1 folds are invariably tight to isoclinalInterlimb angle is 20 to 0 degreesThey are assymetric with stort limbs are 20% shorter than long limbsIt has S1 foliations
20 Deformational Phase 2 and 3 F2 folds can be only seen in thin sectionF3 folds are small folds 1mm to 1cmF3 they distort both the compositional layersF3 crenulation fold axial plane with S1-S2 surface
21 Deformational Phase 4 – D4 F4 folds can be seen on regional mapF4 folds cut through the F1 foldsF4 axial plane strikes northwest to southeastA major faulting event