In this Instructable you'll learn a very quick and easy way to make your own concrete fossil (leaf impression). Leaf impressions can be nice details in larger-scale concrete work, or you can follow these instructions as-is to make stepping stones for the backyard or garden. If you have a big project to pour, this is something easy for the kids to play around with and it keeps any leftover concrete from going to waste.

  • Fresh Leaf
  • Modeling Clay
  • Smooth, Flat, Waterproof surface (a scrap piece of 3/4" melamine was used, but thick plastic will work too)
  • Sacked Concrete
  • CHENG Outdoor Pro-Formula Admixture
Tools / Supplies:
  • Spray Adhesive
  • Diamond Sanding Pads / Sandpaper
  • Plastic Bag to cover while curing
Concrete Mixing:
  • Bucket
  • Water
  • Particle Mask
  • Rubber Gloves

Step 1: Step 1: Make Clay Wall

Clean up the surface you'll be casting on with denatured alcohol. Any dirt, scratches, imperfections and texture will be visible in the finished piece of concrete.

For a very smooth finish, you might try casting on a piece of glass or acrylic. Any surface that won't absorb water will work. If you want to use something like wood, it has to be sealed first or the wood wick the moisture away from the concrete and the surface will be clouded and rough.

Roll out a few 'snakes' and form up the walls by pinching the clay between your fingers and pressing down. It's important that the clay has a good bond to the casting surface. This technique will only work with relatively short walls - anything too tall and the pressure of the concrete will cause the walls to blow out.
<p>I might do a T-Rex Track this way!</p>
<p>I can't seem to nail this....the concrete gets under anything I put down on my board and then it's too deep to dig out easily....thoughts??</p>
<p>Did you try gluing the leave to the board?</p>
I like this very much! Next time we'll eat chicken the bones will end glued on a board and covered with concrete - Archaeopteryx-style! Well done!
<p>You're a Genius! Upload a picture when you do that!</p>
<p>This is great. I've been looking for a way to make a walkway through our herb garden and this would be perfect. We'll just use the leaves of the nearest herbs and possibly add the name so the observer knows just what they're seeing and smelling as they trip through it. Very good description of steps.</p>
Looks nice. What size bag of concrete did you use and how many stones do you think a bag would make?
Great idea!
A great idea and very good instructable. Thank you for sharing this.
very nice, i think it would be awesome to get a skull replica and have dinosaur skull impressions on the stone.

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