Rockhounding.org

USNM 18136

Siskyou County, California
Directions
Next site in CaliforniaUSNM 18140. · 0.5 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 3, 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 California
0.5 miUSNM 18140.Fossil1 miKing TutGold2 miUSNM 18172Fossil

More fossil sites in California

See them all

More sites in California

View all California sites
The Market

New on the Market

Native American arrowheadNative American arrowhead$20cubedmoons3Browse the Market

Found something here? List it for sale

About USNM 18136

USNM 18136 is a fossil collection site in Siskyou, California, cataloged in the Paleobiology Database. Fossils here come from the Kangaroo Creek Formation, dated to the Caradoc (458.2–449.5 million years ago). The depositional environment is recorded as carbonate indet. Documented finds include Helicotoma griffinorum, Boucotspira fimbriata, Sigmelasma pantherae.

Geologic setting

Formation
Kangaroo Creek
Geologic interval
Caradoc
Age
458.2–449.5 Ma
Depositional environment
carbonate indet.
Recorded occurrences
3
Locality notes

SW¼ NW¼ Sec. 29 T41N R7W, China Mountain Quad

Fossils found here

Helicotoma griffinorum
Gastropoda · Helicotomidae
Boucotspira fimbriata
Gastropoda · Helicotomidae
Sigmelasma pantherae
Rhynchonellata · Wangyuiidae

Records and references

Data: Paleobiology Database collection 69234 (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 USNM 18136

Can you collect at USNM 18136?

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 USNM 18136?

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
  • Southwest Treasure Hunter's Gem and Mineral GuideWhether you're digging for the first time or are an experienced rockhound or "prospector," with a simple rock hammer and...See it on Amazon

As an Amazon Associate we earn from qualifying purchases.

Source: Paleobiology Database.