Savannah River Bluffs — Burke & Screven
Low-cost Hawthorn Group bluffs with realistic small-to-mid teeth.
Zone ratings, dig depths, price bands, and species lists are a synthesis of public sources (USGS, state geological surveys, museum records). Treat them as a starting point for diligence, not a substitute for a parcel-specific title search, a coastal/sediment-geologist site visit, and a real-estate attorney. Run a parcel dossier on any specific address before bidding.
Geology you're buying
- • Hawthorn Group
- • Coosawhatchie Formation
- • reworked Eocene
Parcel profile
Why this zone works
- The Hawthorn Group extends well into eastern Georgia and is exposed in cut bluffs along the Savannah River and its tributaries.
- Property prices are the lowest in this atlas — sub-acre river frontage routinely under $100k.
Depth to phosphate / matrix — sub-zones
Hawthorn Group / Coosawhatchie Fm (Miocene phosphatic clays) outcrop in scattered Savannah-River bluffs. Dips rapidly under Pleistocene sand on the broad coastal plain.
| Sub-band | Depth (ft) | Phosphate | Practicality |
|---|---|---|---|
Savannah River / Brier Creek bluff Coosawhatchie phosphatic clay exposed in bluff faces with clear phosphate pebble lag. Towns: Sylvania, Waynesboro, Girard | 0–8 | outcrop | The cliff feeds you — no digging. |
Inland Burke / Screven / Effingham uplands Hawthorn top dips under 20–50 ft of Pleistocene sand away from the river — uneconomic. | 20–50 | deep | Beyond practical excavation — needs a phosphate-style strip operation. |
What you'll find on a well-chosen parcel
| Species | Common name | Typical max | Frequency |
|---|---|---|---|
| Hemipristis serra | Snaggletooth | 1.8" | common |
| Carcharhinus spp. | Requiem sharks | 1.2" | common |
| Galeocerdo spp. | Tiger shark (extinct) | 1.4" | uncommon |
| Otodus megalodon | Megalodon (rare) | 3" | trophy only |
Watch-outs (be honest with yourself)
- Honest assessment: trophy odds are noticeably below the Carolinas and Florida.
- More dig-and-screen than walk-and-find.
Restrictions on excavation & collecting
- GA private-land surface collecting is permitted; landowner permission rules.
- State-owned navigable bottoms require permit consideration — collect on YOUR bank.
Listing checklist — what to verify on a parcel
- ☐ Hawthorn or Coosawhatchie subcrop on USGS mapGood: Th / Tc on the GA state geologic map.
- ☐ Visible bluff exposureGood: ≥6 ft of exposed sediment in the bank.
- ☐ Direct Savannah River or major tributary frontageGood: Brier Creek, Briar Creek, or mainstem Savannah.
Search anchors
Live listing searches
Score a candidate listing
- ✓Parcel type matches zone — Listing parcel type fits Savannah River Bluffs — Burke & Screven.
- ✓Active erosion / exposure on parcel — Listing shows an eroding cliff, bank, or exposed bar — the geology can deliver teeth.
- ✓Shoreline not bulkheaded / armored — Natural shoreline means the system stays alive.
- !Adequate frontage — 150 ft is workable but you'll re-walk the same ground often.
- ✓Price inside zone historical band — Asking sits inside the GA historical band ($60k–$350k).
- !Collecting law has nuance — read carefully — Surface collecting on private land in this state is unrestricted by permit.
- Verify on site: adequate frontage.
- Verify on site: collecting law has nuance — read carefully.
This scorecard runs on inputs you typed. For citation-grade truth — Macrostrat surface geology at the centroid, FEMA flood zone, USFWS CBRS status, Paleobiology DB occurrences, iNaturalist sanity check, and hard-gate logic above the score — generate the full dossier against a real address.