take you to the river...

 cottonwood root system.

 an interesting piece of wood. the size of a nice seat.

 turned it over and discovered it was sycamore! had to bring it home.

 and the roots of a silver maple.

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 found one paver in pretty good shape.

 and this. will probably turn out to be a broken jug. but it is in frozen ground so will bring an excavating tool down and dig it up.