Rockhounding.org

Robber Islands, Trocadero Bay

Alaska
Directions
Next site in AlaskaCoronados Island · 4 mi

Can I collect here?

Pro
See who owns this land and whether it is claimedPro shows the owner, the claim on this spot and every claim within a mile.
Read the collecting rules by land type

Based on our latest records, with claims updated from the BLM on Oct 9, 2026. Land and claims can change quickly, so check before you go.

Minerals on record here

1 mineral

Recorded here: fossil.

Nearby sites

All of Alaska
4 miCoronados IslandFossil5 miBig HarborCopper10 miClam Island - 2030 (2012)Fossil

More fossil sites in Alaska

See them all

More sites in Alaska

View all Alaska sites
The Market

New on the Market

Native American arrowheadNative American arrowhead$20cubedmoons3Browse the Market

Found something here? List it for sale

About Robber Islands, Trocadero Bay

Robber Islands, Trocadero Bay is a fossil collection site in Alaska, cataloged in the Paleobiology Database. The depositional environment is recorded as carbonate indet. Documented finds include Lithostrotion, Zaphrenthis, Stenopora, Anisotrypa, Batostomella, Fenestella.

Geologic setting

Geologic interval
Mississippian
Age
358.86–323.4 Ma
Depositional environment
carbonate indet.
Recorded occurrences
29
Locality notes

Robber Islands (Landones Islands), entrance to Trocadero Bay, west coast of Prince of Wales Island.

Fossils found here

Lithostrotion
Anthozoa · Lithostrotionidae
Zaphrenthis
Anthozoa · Zaphrentidae
Stenopora
Stenolaemata · Stenoporidae
Anisotrypa
Stenolaemata · Stenoporidae
Batostomella
Stenolaemata · Batostomellidae
Fenestella
Stenolaemata · Fenestellidae
Polypora
Stenolaemata · Acanthocladiidae
Cystodictya pustulosa
Stenolaemata · Cystodictyonidae
Orthotetes
Strophomenata · Orthotetidae
Schizophoria
Rhynchonellata · Schizophoriidae
Chonetes illinoisensis
Strophomenata · Chonetidae
Gigantella giganteus
Strophomenata · Productellidae
Dictyoclostus semireticulatus
Strophomenata · Productidae
Productus
Strophomenata · Productellidae
Pustula
Strophomenata · Echinoconchidae
Chonetipustula concentrica
Strophomenata · Araksalosiidae
Camarotoechia
Rhynchonellata · Camarotoechiidae
Spirifer striatus
Rhynchonellata · Spiriferidae
Syringothyris
Rhynchonellata · Syringothyrididae
Torynifer pseudolineatus
Rhynchonellata · Elythidae
Conocardium
Rostroconchia · Conocardiidae
Platyceras
Gastropoda · Platyceratidae
Phillipsia
Trilobita · Phillipsiidae
Camerisma prava
Rhynchonellata · Stenoscismatidae
Camerisma girtyi
Rhynchonellata · Stenoscismatidae
Coledium dutroi
Rhynchonellata · Stenoscismatidae

Records and references

Data: Paleobiology Database collection 112172 (CC BY 4.0) — view the source record

Getting there

No directions yet.

How hard is it?

Getting there
– / 5
Finding anything
– / 5
Votes
0

Trip reports

No trip reports yet.

Questions about Robber Islands, Trocadero Bay

Can you collect at Robber Islands, Trocadero Bay?

It depends on who owns the land and whether a mining claim covers it. BLM land usually allows hand collecting for personal use, national parks allow none, and private land needs the owner’s permission. Pro members see the owner and any claims at this spot.

What minerals are found at Robber Islands, Trocadero Bay?

Fossil.

Comments

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

No comments yet.

What to bring

The whole kit
  • Estwing E3-22P Rock PickThe industry-standard 22oz geological hammer. One-piece forged steel with shock-reduction grip.See it on AmazonCompare picks
  • Clear Anti-Fog Safety Glasses (4 Pack)Adjustable, anti-fog lenses for clear vision in any conditions.See it on AmazonCompare picks
  • Watertight Medical KitCompact, waterproof first aid kit with bandages, moleskin, and field essentials.See it on AmazonCompare picks
  • Rockhounding Alaska: A Guide to 80 of the State's Best Rockhounding SitesRockhounding Alaska is a must-have book for collecting rocks, minerals, and fossils in the Last Frontier. This guidebook...See it on Amazon

As an Amazon Associate we earn from qualifying purchases.

Source: Paleobiology Database.