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I think a sluice box scenario is applicable. The force of the moving water has to be less than the baffles ability to hold the heavier material in place. If there were no baffles, all the material would move downstream, some maybe a bit quicker than others. I think any terrain that is durable enough to remain substantially unchanged by wind forces is not acting like typical pieces of lead shot.

I think a reasonable question for an anti lead hunter/shooter is, what are your motivations, what are your goals. If they're reasonable and attainable, how could there be opposition. One might be forth coming and factual about intended and unintended consequences, not just looking for the satisfaction of a 'win'.

It is thought that the vast majority of gold on earth is near the core, precisely because of it's density.A small amount makes it's way closer to the surface due to volcanic activity, and plate tectonics would likely play a role as well. But put a nugget or coin on the surface in most soils, and it is going to sink over time, like lead shot and bullets.

I'm not sure if Hal watched his Folsom point just lay on the surface without moving for Lord knows how many millennia. But doesn't it seem strange that particular patch of Wyoming prairie remained static for all those many centuries, and that there was neither any erosion or addition of soil to the strata from 10-12,000 years of prairie plant growth since some early human left it there?

Unlike Hal, I wasn't there watching and knowing without a doubt that Folsom point remained motionless on the surface. But Hal must have been watching it, otherwise, how would he be so certain?

Lloyd's observations of the legal maneuvers by scientists for the mining companies are interesting. One thing that occurs to me is that the EPA and government have pretty deep pockets to litigate these matters. The scientists and lawyers for the mining companies must have made a pretty convincing argument in order to stave off the popular idea that lead in all forms is going to be the destroyer of life on this planet.

Good question, as I could only remember that it served the legal purposes of the mining companies. I attempted to look it up and found this:

https://www.ncbi.nlm.nih.gov/pubmed/525854

Evidently, the pigs were very tolerant of the lead....

It is not hard to find rocks that rise in fields due to frost action.

Be that as it may, lead in the first 3/8" of the surface is pretty abundant in some fields. But probably only where high volume shooting of fixed positions are the rule.

I know little of Wyoming prairie, but I hunt artifacts here in the deep South and sometimes dig for them when I locate a habitation site. I can assure you that flint atlatl and spear points do indeed migrate down to the hardpan in our sandy soils. Sure I find plenty in agricultural fields on the surface but those artifacts are brought up by tillage, bottom plowing especially...Geo

The lesson I learned then was that almost any science you see quoted for political purposes will not stand-up well under proper peer-reviewed scrutiny. Scientists are no different than any other folks trying to survive and get ahead. They stick their fingers up into the wind to see which way it's blowing and then produce efforts that will garnish financial support from somewhere. Look up "Operation Paperclip" sometime about the Nazi scientists we brought here after WWII. Modern researchers face similar challenges in universities that are clearly left-leaning and many of them have families to feed as well...

Craig if there were no baffles, would not gravitational sorting still occur as soon as the sluice water begins to slow down after leaving the box? When I see gully erosion in the glacial till underlying most of the cropland here, the rocks and pebbles are at the top, then the sands, and then the silts, clays, and crop residue at the bottom.
Isn't that why the water in the streams and rivers below turn muddy and why the Mississippi Delta has grown so large since agriculture began in its watershed?

Lloyd you are sure right about scientists constant need for funding. Anything to do research and gain experience in their field of interest. Many agricultural colleges get way more grants from corporations than they do from the tax-supported agencies.
And I don't doubt that funds quickly dry up if the results of the studies do not support what the grantors intended to prove or disprove by funding these studies. There are many ways to help guarantee a positive outcome simply by the project design.

Whatever. I just feel better eating steel than I do lead when I wolf down those tasty grilled dove breasts wrapped in bacon.

Whatever. I just feel better eating steel than I do lead when I wolf down those tasty grilled dove breasts wrapped in bacon. /quote]

Seems to me that all our ancestors must have died out as a result of eating the lead-poisoned meat they hunted.
Ergo, we probably were never born..............

Plus they did not have smart phones - no chance of survival!

So which is it... are the silts and clays and other fines at the bottoms of erosion cuts???... or do they get washed away and end up in places like river deltas???? Or do you get to have it both ways in the Twilight Zone?

Regardless, the forces behind deep erosions are not what takes most of our small dense lead spheres deeper into the soil over time. Fast moving water does not float large rocks and stones to the top. They are simply too heavy to be moved as easily, and get left behind.

Apparently it's all about what makes you feel good that drives your beliefs and conflicting observations. Does that bacon wrapped around the dove breasts make you feel like your arteries are plugging up with cholesterol plaques? I'd bet the science says more people are at risk from saturated fat induced coronary heart disease than they are from possibly swallowing a stray lead shot pellet, and having it pass out of their digestive tract. And I think most dentists would see greater job security from patients biting into steel versus lead.

Chew gently!

More telling is why none of these biased scientists can explain what Stan mentioned earlier.....how South American countries have no shortage of birds. My goodness...the amount of lead in their marshes, lakes, agriculture fields has to be astronomical...it�s a wonder why every living thing down there isn�t dying a slow, agonizing death of being massively poisoned by heavy metals. Yet year after year...there�s more birds. They still use pesticides and herbicides down there that have been banned here in North America for decades. Unbelievable! It�s amazing.