It's difficult to say what offerings were given, if any (it was a bog... swamp) and it's entirely possible that organic material (flowers, food
offerings, even woven straw or cloth) was rotted away or eaten away quickly. Swamps aren't tidy sites, and things wander through them, push
materials down to other levels, etc.
My NEXT project for the Dallas Museum of Nature and Science involves working on dinosaur bones that were found in the equivalent of a swamp/marsh.
It's a nightmare... everything smooshed and folded together and bodies in a real jumble (bones crushed almost beyond recognition.) Untidy burials
are difficult to deal with.
This could have represented multiple practices and beliefs. One area might be sacrifices, another might be war captives, another might be criminals.
At a guess there appears to be at least three distinct cultures involved.


