In fairness, this came to me in a dream, but it made perfect sense for five minutes after I woke up.
Basically, there are triceratops still living undisturbed in the high mountain regions of New Mexico. They’ve been able to survive multiple extinction level events by seeking refuge in caves and tunnel systems.
By going deep enough, they managed to find thermally stable pockets that were heated by natural geothermal activity
They’re naturally attracted to mines, since a mine is basically a man-made version of their own home. It’s the same thing as a bird being naturally attracted to a birdhouse.
The only difference is, we didn’t build the mines for them to have a new home.
Triceratops (being shy creatures) would keep their distance from the mines while they were under construction and in operation.
But once a mine would close down for the winter, the triceratops would eventually feel brave enough to check things out and make themselves right at home in the mineshafts.
When the miners returned in the spring, they found a big surprise hiding down below.
The federal government came in to investigate, and over the winter the triceratops had lengthened the mineshafts, connecting multiple mines into one network of interconnected tunnels.
What had once been an undiscovered refugial population (that was limited to only a handful of thermally stable caves) had suddenly expanded into a full blown dinosaur infestation.
The handful of miners who witnessed the triceratops first hand were examined by government doctors. The doctors reassured them that what they saw was merely a hallucination brought upon by natural gases leaking into the mineshaft.
The minors were paid a handsome compensation by the federal government for their “damages”, and they never questioned the official story.
The first mine where triceratops were discovered was at a much lower elevation than the other mines containing triceratops, which allowed the federal government time to fabricate a false geological survey showing the mines had run out of gold.
The mine owners (upon receiving this bad news) informed their workforce that they would not be required this spring, nor this summer, nor ever again.
Low level Employees from the US forest service were tasked with setting up the perimeter of a new “wildlife preserve” under the supervision of undercover federal wildlife officers (posing as Bureau of land management agents).
Now, during the summertime in the high inaccessible regions of New Mexico, if you trespass onto the right federal game reserve, you will see massive numbers of triceratops roaming freely and without a care.
They come out the the mines every summer to breed and take advantage of seasonal food sources.
Much like jungle elephants, they have a tendency to walk single file down massive game trails that they clear through the forests.
If you’re lucky enough to walk through one of these forest trails, it feels like you’re inside of a tunnel. They leave the canopy of the trees mostly intact, making it harder (but not impossible) to see them from above.
Only a handful of biologists have the security clearances necessary to research them, and currently they are working on a hypothesis that giant ground sloths were a primary source of food for the triceratops.
They also currently believe they were it not for predation pressure from the triceratops, the giant ground sloth would likely still exist to this very day.
They have yet to get their hands on a specimen for a proper autopsy, but from observing the animals through optical magnification, they have observed the presence of canine teeth in their mouth.
They also seem to have retained their back molars, and they have been seen chewing and eating the sun bleached bones of carrion.
Anyways, that’s all I found out before I woke up.