| OBJECTID | MapUnit | Name | FullName | Age | Description | HierarchyKey | ParagraphStyle | Label | Symbol | AreaFillRGB | AreaFillPatternDescription | DescriptionSourceID | GeoMaterial | GeoMaterialConfidence | DescriptionOfMapUnits_ID |
|---|
| 1 | None | Quaternary | None | None | Sand, yellow- to brownish-white in color, fine- to coarse-grained, subrounded to rounded, predominately quartzose, silty, clayey; humus lenses common. Streams on clay subcrop will exhibit shallow, wide alluvial plains while streams on sand subcrop tend to incise creating steep valleys with narrow alluvial plains, silicified wood common. Thickness approximately 15 feet along larger streams, thinning up tributaries. | 1 | DMU-Heading1 | None | None | None | None | OF0357 | None | None | DMU01 |
| 2 | None | Holocene | None | None | None | 1-1 | DMU-Heading2 | None | None | None | None | OF0357 | None | None | DMU02 |
| 3 | Qal | Alluvium | Alluvium | Holocene | None | 1-1-1 | DMU Unit 1 | Qal | Qal | 255,255,179 | None | OF0357 | Alluvial sediment, mostly fine-grained | Medium | DMU03 |
| 4 | None | Tertiary | None | None | None | 2 | DMU-Heading1 | None | None | None | None | OF0357 | None | None | DMU04 |
| 5 | None | Pliocene | None | None | None | 2-1 | DMU-Heading2 | None | None | None | None | OF0357 | None | None | DMU05 |
| 6 | Tmt | Magee Terrace | Magee Terrace | Pliocene | Generally fining-upward sequence of fluvial siliciclastic deposits attributed to courses of the Plio–Pleistocene ancestral Tennessee–Ohio River system. Sand is yellow, orange, purple, red, and pink; fine to coarse grained; predominantly quartzose; cross bedded to massive. Graveliferous, containing pea to cobble size clasts typically not exceeding 3 in. in length; clasts composed chiefly of chert with lesser amounts of quartz. Chert gravel is deeply weathered and typically incompetent above the water table and can be leached to tripolitic clay. Clay is kaolinitic, pink to white and occurs as discontinuous lenses and as basal rip up clasts. Floodplain silts and clays are preserved above approximately 550 ft MSL. The base of the unit is unconformable at roughly 400 ft MSL. Conglomeritic ironstone is commonly developed at the contact with the underlying Hattiesburg Formation. | 2-1-1 | DMU Unit 1 | Tmt | Tmt | 255,255,0 | None | OF0357 | Sand and gravel of unspecified origin | Medium | DMU06 |
| 7 | None | Miocene | None | None | None | 2-2 | DMU-Heading2 | None | None | None | None | OF0357 | None | None | DMU07 |
| 8 | None | Grand Gulf Group | None | None | None | 2-2-1 | DMU-Heading3 | None | None | None | None | OF0357 | None | None | DMU08 |
| 9 | Tha | Hattiesburg Formation | Hattiesburg Formation | Miocene | Deltaic sands, silts, and clays; Clay, green, gray, brown, weathers white to brown, silty to sandy, locally lignitic; Sand, gray, pale yellow to white, fine- to coarse-grained, cross-bedded to massive with thinly-bedded pea gravels; Pea gravel, black chert and milky quartz, highly polished, sub-angular to well rounded; often indurated to sandstones and siltstones at surface, predominantly quartzose with lesser amounts of chert, metaquartzite, mica, and heavy minerals, slightly glauconitic in places, silicified and coalified wood common. The base of the Hattiesburg Formation is designated at the base of a sand unit of regional extent that occurs above the last occurrence the benthic foraminifera Heterostegina texana at the approximate horizon of the base of the Fleming Formation in Louisiana and the Amos Sand in Alabama. Total thickness not represented in the mapping area. | 2-2-1-1 | DMU Unit 1 | Tha | Tha | 217,140,156 | None | OF0357 | Sandstone and mudstone | Medium | DMU09 |
| 10 | Tca | Catahoula Formation | Catahoula Formation | Miocene | Deltaic to marine gravels, sands, silts, clays, sandstone, ironstone, and limestone. Sand is gray, pale yellow to white; fine to coarse grained; cross bedded to massive. Contains rare thinly bedded pea gravel layers. Gravels consist of highly polished black chert and milky quartz, ranging from subangular to well rounded. Sand is commonly indurated near the surface to sandstone. Predominantly quartzose with lesser amounts of chert, metaquartzite, mica, and heavy minerals; slightly glauconitic in places. Silicified wood and fossil palm fragments are common. Clay is green, gray, and brown; weathers white to brown in color; silty to sandy. Lignite is common in basal clay intervals. Unit is fossiliferous in part. Limestone (Tatum Limestone Member) is characterized by the benthic foraminifera Heterostegina texana. Occurs in the subsurface within the Catahoula Formation. The Catahoula Formation unconformably overlies and locally incises into the underlying Bucatunna Formation. Estimated thickness is approximately 540 ft. | 2-2-1-2 | DMU Unit 1 | Tca | Tca | 252,89,102 | None | OF0357 | Sandstone and mudstone | Medium | DMU10 |
| 11 | None | Oligocene | None | None | None | 2-3 | DMU-Heading2 | None | None | None | None | OF0357 | None | None | DMU11 |
| 12 | None | Vicksburg Group | None | None | None | 2-3-1 | DMU-Heading3 | None | None | None | None | OF0357 | None | None | DMU12 |
| 13 | Tbu | Bucatunna Formation | Bucatunna Formation | Oligocene | Only divided out in cross section. | 2-3-1-1 | DMU Unit 1 | Tbu | Tbu | 178,178,178 | None | OF0357 | Mudstone | High | DMU13 |
| 14 | Tv | Vicksburg Formation | Vicksburg Formation | Oligocene | Includes the undifferentiated associated marine units, listed in descending stratigraphic order: Bucatunna Formation, Byram Formation, Glendon Formation, Marianna Formation; and Mint Springs Formation. The Bucatunna Formation consists of carbonaceous clays dark brown to gray in color, silty to fine sandy, averaging about 45 ft in thickness but reaching up to 60 ft within the mapping area. The Byram Formation is composed of sandy to clayey marl, glauconitic and fossiliferous, with a thickness of up to approximately 12 ft. The Glendon Formation consists of semi crystalline limestone interbedded with softer clayey marls and represents the marine highstand of the early Oligocene Vicksburg sequence. The underlying Marianna consists of soft clay marls. Collectively the Glendon-Marianna section reaches a maximum thickness of about 30 ft in the mapping area; The Mint Springs Formation consists of gray to green colored glauconitic and fossiliferous quartz sand. The Vicksburg Group is biostratigraphically characterized by the presence of Pecten byramensis and the larger benthic foraminifera Lepidocyclina sp. The Vicksburg Group unconformably overlies the Forest Hill Formation. | 2-3-1-2 | DMU Unit 1 | Tv | Tv | 168,0,0 | None | OF0357 | Mostly carbonate rock | High | DMU14 |
| 15 | Tfh | Forest Hill Formation | Forest Hill Formation | Oligocene | Deltaic sands, silts, and clays. Sand is fine-grained, silty, and quartzose; clay is carbonaceous and laminated, with lignite and silicified wood common. Carbonized plant fossils occur along fissile partings in clay intervals. The Forest Hill Formation unconformably overlies and commonly incises into the Yazoo Formation and represents the lowermost unit of the Vicksburg Group, distinguished from overlying units by its terrestrial to deltaic depositional setting. Approximate thickness is 80 ft in the mapping area. | 2-3-1-3 | DMU Unit 1 | Tfh | Tfh | 191,99,0 | None | OF0357 | Sandstone and mudstone | Medium | DMU15 |
| 16 | None | Eocene | None | None | None | 2-4 | DMU-Heading2 | None | None | None | None | OF0357 | None | None | DMU16 |
| 17 | None | Jackson Group | None | None | None | 2-4-1 | DMU-Heading3 | None | None | None | None | OF0357 | None | None | DMU17 |
| 18 | Ty | Yazoo Formation | Yazoo Formation | Eocene | Outer neritic to bathyal marine clay. Clay is calcareous and montmorillonitic, blue green when in color unweathered, sparingly fossiliferous marine mollusk shell hash common along partings and bentonite seams present. Limestone ledges occur in places. The Yazoo Clay reaches a thickness of approximately 515 ft. The Yazoo Formation is marked by the planktonic foraminifera Hantkenina alabamensis. The Yazoo Formation conformably overlies the Moodys Branch Formation. | 2-4-1-1 | DMU Unit 1 | Ty | Ty | 255,204,0 | None | OF0357 | Marine sediment, mostly fine-grained | High | DMU18 |
| 19 | Tmb | Moodys Branch Formation | Moodys Branch Formation | Eocene | The Moodys Branch Formation represents the basal member of a marine transgression towards the close of the Eocene epoch, situated unconformably above the deltaic to estuarine Cockfield Formation and conformably below the outer neritic to bathyal clays of the Yazoo Formation. It consists of sandy, fossiliferous marl containing abundant marine mollusk shells of the genera Glycymeris and Venericardia. The unit unconformably overlies the Cockfield Formation, reflecting the delta destructional phase and subsequent marine transgression, and it conformably grades upward into the Yazoo Formation. Total thickness is approximately 15 ft. | 2-4-1-2 | DMU Unit 1 | Tmb | Tmb | 171,107,79 | None | OF0357 | Marine sediment, mostly fine-grained | High | DMU19 |
| 20 | None | Claiborne Group | None | None | None | 2-4-2 | DMU-Heading3 | None | None | None | None | OF0357 | None | None | DMU20 |
| 21 | Tco | Cockfield Formation | Cockfield Formation | Eocene | Deltaic deposits dominated by clays in the upper portions of the formation and sands in the lower portion. Clays are gray to brown in color, silty to fine sandy, plastic, strongly carbonaceous with thin beds of lignite common, slightly micaceous, and locally pyritic. Sands are quartzose and are cross bedded to massive, locally lignitic, and can be silty to clayey. | 2-4-2-1 | DMU Unit 1 | Tco | Tco | 237,222,130 | None | OF0357 | Sandstone and mudstone | Medium | DMU21 |