Friday, May 8, 2009

Fieldwork Friday #5

After a long break, here is another episode of Fieldwork Friday.

This was the last of our spring trilobite collecting trips for this year. We headed out to the House Range of west-central Utah (west of the town of Delta), long known to be a trilobite collecting mecca of sorts. I had never visited this area before, but had long heard rumors that trilobites there are so common you could just pick them up off the ground. These are the common types of trilobites (usually Elrathia kingi) that you will see in nearly every rock shop across the United States. John was interested in visiting to gather some more data for his presentation at the International Conference on the Cambrian Explosion.

The trilobites we collected were from the Middle (to Late?) Cambrian Wheeler Shale, Marjum and Weeks Formations. Lucky for us we had a friend along who was familiar with the area and could show us some good collection localities. But it is not hard to see where others have looked. As you drive into the area it is pockmarked with hundreds of holes. It is kind of sad (to me) to see the area just destroyed all in the name of looking for trilobites. There are really no regulations it seems to keep people from doing this. The land in this area is mostly BLM land, and it is legal to collect a reasonable amount of common invertebrate fossils. But this is where the trouble starts. It appears that many people in the area operate "Flagstone quarries." The one I visited had already been shut down by the BLM, but sadly these people left a HUGE hole in the ground, large amounts of trash, and nearly a hundred banded up, ready to go, pallets of rock.



When you look closely at the rock, this is what you see:


Those are hundreds of inarticulate brachiopods (Acrothele?). I would guess they classify as a "common invertebrate fossil." But the BLM website clearly states "If you wish to collect common invertebrate or plant fossils for landscaping, sale, or commercial purposes you must apply to the BLM for a mineral materials sale." [link] I guess these people had not done that, or were being deceptive and selling trilobites. Who knows?! We observed trilobites in these pallets of rocks. The trilobites at this site however would typically require some sort of preparation (air abrasion).


It was cold and windy most of the time we were there, which was not a blast, but at least it was not raining or snowing. The last day was great - sunny and warm. We took the dog again and he seemed to have fun.


The shales were pretty easy to split. The limestones required a little more muscle, but were nice to work with. We found more complete trilobites here than we did in either the Marble Mountains or at Spence Gulch, but they are often missing their cheeks.



There were also some pretty big trilobites out there (larger than at any of the other sites we have collected at):


We also spend a morning looking for eocrinoids (Gogia). We found two.



There were also commercial collecting spots located in this area where you can actually pay these people to dig up rock with a back hoe and give it to you to sort though, so you can find your own trilobites. Seems barbaric and like cheating to me, but that is just my opinion. Why in the world would you pay people to do this for you when all you have to do is get out of your car, walk 100 yards and look down. Seriously, it was that easy in most areas. Looks for some shale and then look down. I guess if you did not know what you were really looking for, but it seems like a waste of money to me. In the first picture below you can see the number of trilobites we surface picked at one site.


Some other fun trilobite pictures from the trip:



© ReBecca K. Hunt-Foster. Please see the "Field Work Friday Rules" about the work I do and collection practicies.

3 comments:

Tony Edger said...

Enjoyed this post very much. Some great trilobites turned up. I was struck by the BLM policy that would grant a permit to collect plant and invertebrate fossils for subsequent sale. I thought commercial collecting of fossils on federal land was prohibited under all circumstances. At a minimum, wont the Paleontological Resources Preservation legislation mean that, even with a permit, the collected fossils remain the property of the U.S. and couldn't be sold? I'm puzzled.

Silver Fox said...

ReBecca, you are getting some neat field work in, and this trip looks especially fun! The photo of people on a shaly-slaty slope reminds me of similar trilobite expeditions (maybe the rocks always look the same).

I think that commercial fossil collecting is considered similar to minerals mining, and so it would have to require a permit (and hopefully some kind of payment) - it's like that with mineral specimens for commercial uses, also - though that requires claims, and probably requires some kind of project permitting for pits dug or roads made. I would think that any kind of quarry would require some permitting to be legal.

ReBecca Foster said...

Tony: From what I understand it is legal (in some states) to sell some fossils from *state* land, with a permit.

On BLM land you need a mineral removal permit to sell petrified wood for profit (or if you intent to collect over 250lbs of petrified wood). Also, "If you intend to collect and study scientifically significant specimens of petrified wood for permanent inclusion in a museum collection, then you will need a paleontological resource use permit." [BLM Hobby Collecting Utah website]

The BLM website also states: "If you wish to collect common invertebrate or plant fossils for landscaping, sale, or commercial purposes you must apply to the BLM for a mineral materials sale."

I DO know that it is illegal to sell any fossils from National Park Service Land. I am not certain about Forest Service land, but I am guessing it is probably similar to BLM rules.

I agree though that it is puzzling that they would allow this to happen at all. I think the PRP legislation is not going to change anything in this area. I will try to find out next week when I am at the Federal Fossil Conference, as there will be quite a bit of discussion surrounding the PRP.


SF - Thanks! We have had a fun spring so far. Hopefully the summer will go just as well. We are getting ready to open our quarries this week to start work next week. Where has the time gone!

I think you may be right about the permits, but I do not think you can get a permit to do a giant commercial excavation like what was taking place to collect fossils (on Federal land at least, I guess you can on state land). It was obvious that those rocks on the pallets were not for flagstone as they were full of fossils! Very very obvious fossils at that. But I am not sure if it is because they are "common" fossil that the BLM does not care (as much)?