Infrastructure question
I asked how Cahokia got its water, and how did it dispose of sewage. "Haul water by pot from the river" was the suggestion for input--though enough to supply 10-20,000 people is a lot of haulage. Nobody knew about output. It may have been the same. Dumping waste in the borrow pits (where they dug the dirt to build the mounds) would have been an easy but stinking idea. So, since there was no obvious drainage, they probably used night soil luggers hauling to the river--or maybe the farms, though quick googling doesn't show any references to Amerindians doing that. Maybe urine lugging too, but maybe not--also stinky, but less of a health hazard. Still, they planned a lot of the city, so probably they planned something.
Engineering issue 1
Hauling water from one of the network of nearby channels would have been tedious but doable--and if they had "rain barrels" that would have reduced the need. (No malaria yet, though mosquitoes are always annoying.). However, the channels changed over time. This could be problematic for both the water supply and for trade, since quite a lot would have been water borne.
I noticed one figure that appeared twice--a swimming beaver with a stick in his mouth and front paws. If, from time to time, they had to do some dam-work of their own to make sure the river channels they wanted didn't dry up, they beaver would have been an important icon. Of course any dam-work would have rotted away a thousand years ago. But they did a lot of palisade-work, so they had access to lots of logs. This is just a hint; and I'm not sure where, if anywhere, you could look to find out whether they dammed or not.
Engineering issue 2
Monk's Mound has had a number of cores taken, and it looks like it has suffered from several major slumps over the past thousand years. We were told that the Mississippians tried different combinations of soils and clays and internal structures to try to maximize stability. In one place researchers found a layer of cobbles, with no obvious purpose. Maybe this was to help with drainage in an earlier iteration of the mound? The mound was built in stages, with what seem to my untrained eyes to be different layouts, though maybe there was some unifying principle. I gather that sections started slumping while it was still being built.
Lightning
On Monk's Mound, the top level supposedly held a huge fence, a 40-50' high building for the chief, and an even taller pole in front of the building in the courtyard. This would have been the tallest thing for miles in any direction. We get thunderstorms in this part of the world--frequently.
That tall pole would have gotten plenty of strikes. I suppose they must have had to replace it regularly. However, it might have helped protect the great house. For a while.
I wonder how the Mississippians would have interpreted that. Perhaps one of the functions of the Supreme Leader was to take all the lightning strikes for the city onto himself.
We were told that Natchez tribe had characteristics most like the Mississippians, and so their customs are used as models. In the link, lightning set fire to one of their temples and the distraught citizens went so far as to throw children into the flames to try to get the gods to put out the fire. I'm not sure what that means about what they thought of lightning, but it does suggest that fire prevention wasn't perceived as high on their priority list and lightning wasn't one of the great worries.
Plaza
They flattened out the surface of the Grand Plaza--an undertaking as massive as the construction of the Monk's Mound itself--though needing less dirt from elsewhere. I wonder why. Maybe for massive games that needed flat surfaces, or maybe the Supreme Ruler got tired of ruts and mandated smoothness?
Tools
They dug all this dirt with stone tools. A stone hoe looks stupidly dull, and would have been painful to dig with--except in mud, and that would have been painful to lug around. And a stone axe looks like it would do more crushing than cutting.
I used to wonder why they didn't sharpen the stone axe more, until I watched the center's video of knapping. I think I get it now. Stone can be pretty brittle, and sharper stones would chip and snap rather quickly. Maybe you could get more done with a sharp axe before it chipped too badly and you had to get a new stone, but they weren't easy to make as it was. Dull and strong was probably a decent compromise.
Defense
The palisades around the Grand Plaza were built/rebuilt 4 times in a century, with plenty of bastions. Clearly they had enemies--bastions like that look silly if for a purely ritual formation.
The bastion/entry pair scheme doesn't make much sense unless the rest of the common folk of the city could gather inside, so they must have had grain and water storage inside the Plaza--not huge, since there don't seem to have been many other towns of size big enough to man a siege. Maybe the sister St. Louis and East St. Louis settlements provided the raiders. Civil wars are always "a thing" in history. The palisades would need of order 100,000 trees each time. I wonder if they dragged them from nearby or floated them downstream from logging elsewhere? (There's that beaver motif again.)
Galena
They had galena for ornaments, but not lead. I wondered about that, but it turns out you have to pre-roast the ground-up ore to burn off the sulfide and make an oxide--and that's a noxious step with not immediate payoff. Only after roasting the oxide with charcoal do you get lead.
Natchez
As noted above, the Natchez are supposed to have been the most similar of the surviving tribes to the Mississippians. A burial in mound 72 had a few men, one with a huge pile of expensive grave goods, and over a hundred women.
They had a legend of a founding leader who taught them and directed them to a new country. They also had (as is almost universal) a story of a great flood which some escaped on a high mountain. Cahokia had suffered a great flood, and Monk's Mound would have been a possible refuge--but perhaps the story inspired the mound?
Art
For some reason the bird man image struck me as Mayan, but I can't think why because the styles are quite different. Maybe the feathers and the over-drawn nose?
Many figures are depicted kneeling. Maybe this was to show proper subservience, but maybe it was a stylistic convention designed to let you make a human figure as large as possible for a given chunk of rock. If you carved a standing figure from a 5" rock, the head and torso would be 2 1/2 inches high, but if the figure is kneeling you can make them almost 4" high.
Reconstruction
Several mounds were excavated, and then rebuilt. Even the Monk's Mound has been partly rebuilt, but I gather they haven't tried to restore it to original (pre 1250) form.
Today
St Louis was clear in the distance. The new city has a dozen times the area, a hundred times the population, and thousands of times the wealth of the old city. Although, as Merlin pointed out, how can you be really rich without servants? And the Birdman might have added, without a hundred wives?
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