CaSPR – Case 3-19: Shamans Portal/Beaver Dunes

Team:  Cryptid and Supernatural Paranormal Researchers (CaSPR)

Team Members:  Bo Luellen, Trevor and Cindy Messner

On February 3rd, 2019, our team started evaluating the existence of a hidden cave system in Beaver, OK known as The Shamans Portal. According to reports that date back to the 1500s, there is a passage that leads underground in the Beaver Dunes. The area is used heavily by dune buggy enthusiasts and is known as “No Man’s Land,” but has another nickname, “Oklahoma’s Bermuda Triangle.”

The Legend:

  • Beaver Dunes Park in Oklahoma’s panhandle is known as a great place for ATV riding with over 300 acres of sand dunes. It is also notoriously called “Oklahoma’s Bermuda Triangle” for strange occurrences dating back to the times of the Spanish explorer Coronado. Native Americans tried to warn Coronado of the perils of the dunes, but he didn’t listen. Three of his men disappeared into paranormal flashes of green light while exploring the area without any sign (according to Coronado’s journal). Ever since there have been accounts of other people, who have simply vanished into a mysterious alternate dimension in the same way. No definitive explanation has ever been given, but it is often thought that the poor souls are unfortunate victims of what has since been named Shaman’s Portal.” –
  • Rumors also abound that Men in Black type military personnel have been spotted digging in the area following reports of a UFO crash.

The Investigation:

The Beaver County Sheriff’s Department


We began our investigation by contacting the Beaver County Sheriff’s Department. They stated they couldn’t confirm its existence of an opening in the Dunes. According to their department, the Dunes seem to fall under the county authority of Beaver. Upon further investigation, they confirmed that there wasn’t any single agency in charge of the Dunes. It was a state park, but no on-site management.

The OU Geology Department


My next stop was to the Oklahoma University Geology department. Confidential experts within that department offered us some interesting clues in the search for truth. I would like to offer our thanks to those individuals. Their observations are as follows:

Anonymous Source #1

“Bo: Attached are 2 geologic maps of Beaver County showing the types of rocks or other geologic materials at the land surface throughout the county (they both show the same geologic information). They show that most of the county is mantled by the Ogallala Formation and that there is a fair amount of dune sand in the Beaver area.


The attachment above is the map that accompanies Bulletin 97.

Also below (HA-373) is another map of the Beaver County that shows the same outcrop information.


A major problem in your search for a cave is that dune sand is almost always loose, uncemented material that cannot support a cave. Any small or large, horizontal hole in the loose sand would immediately collapse because the roof is not a cemented or competent material that can hold a “bridge” over an opening. Therefore, it is almost inconceivable that a hidden cave system exists within a sand dune area unless the sand grains have been cemented together to allow such a bridge to form. Most natural caves of the World are formed in water-soluble rocks, such as limestone, dolomite, or gypsum.

One ray of hope for you may lie in the presence of gypsum in some of the Permian bedrock that is shown in blue or red on these geologic maps. Natural gypsum caves do occur at many places in western Oklahoma, and it is possible that one such cave exists in the Beaver area, perhaps in or adjacent to the Beaver Dunes. Unfortunately, the attached geologic maps are the only geologic maps for the area, and there are no other maps with greater detail to show the location of individual gypsum deposits in the area.

I hope this information will be of use to you, and I wish we could be of more assistance.”

Anonymous Source #2

“Bo –

Let me second what (**Anonymous Source #1**) said. Given the formations that are present near the town of Beaver, it is highly unlikely that a natural cave exists in the area. There is always the possibility that a human-dug cave or mine exists, but there is no official record of anything like that.

A more recent geology map of the area is at



The Ogallala Formation is the most common formation throughout the area, and it does not contain any caverns. Like (**Anonymous Source #1**) said, the sand dunes that overlie the Ogallala would not contain caves and would fill and bury any that formed beneath it. There is a very slight possibility that the Cloud Chief Formation (see the geologic map) contains caverns because it contains gypsum beds, however, the beds are thin, sporadic, and unlikely to contain anything in the way of a sizable cavern.”

Coronado’s Journal

After extensive searching, no journal entry from Coronado detailed the accounts of strange deaths under the circumstances presented in the legend.


On-Site Testimony

Our team spoke with dune buggy enthusiasts that go to the Dunes regularly. They had no observations of a large opening in the parks sandy floor. Furthermore, they stated that it would be a significant hazard to recreational ATV’s if one existed.


The Case Findings:

Thanks to the experts and civil servants contribution to this case, I was able to come to a theory that the area was unsuitable for an opening. As the first Anonymous source stated, there are opportunities for caves on the outskirts of the Dunes, but to date, no specific longitude and latitude has ever been reported. Until concrete evidence appears, no further action will be taken, and this case is closed as an unsubstantiated urban legend.

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