With all the excitement brewing over the opening of A Step into Africa and the return of lions to Seneca Park Zoo, I thought our blog readers might be interested in learning more about my favorite part of the new exhibit: the Dig Zone, an exhibit which replicates Olduvai Gorge.

Photo by Kelli O'Brien
For the past few years, I have been extremely lucky to be a part of the team developing the Dig Zone area. Three years ago, the Dig Zone was a blank slate, a kidney-shaped space on the topographical map of what would become A Step into Africa. I was thrilled to be tasked with filling in that space with what I hope you will agree is the most engaging, educational dig experience at any zoo or museum.
Many decisions needed to be made; after all, we have 4.5 billion years of history to work with! The first decision that needed to be made was what time period to focus on. It did not take long to settle on our time frame of 1.8 million years ago. Why? Because 1.8 million years ago in the area we now call Olduvai Gorge, amazing things were taking place!
Early hominids called Homo habilis were making some pretty complex stone tools, hunting strategically, butchering animals in fairly similar fashion to how things are done today, even cooking! My favorite story from that time period revolves around a fossil that dates to this age, OH8, the record number for a nearly complete foot of Homo habilis. A portion of the heel is missing and there are two teeth marks right through the top of it, which match the teeth of Crocodylus anthropophagus, literally translated as a man-eating crocodile! More hominid fossils indicating a similar demise tell us an interesting story, at one time, man was not at the top of the food chain!
So, aside from our crocodile and hominid, what other species would we want to represent? Well, at one time, this now-arid region was a lake surrounded by volcanic ash deposits and the fossil record supports this. So, be sure to look for fossils of animals you’d expect to find in a freshwater lake, like turtles and stingrays. You can also expect to find some evidence of a butchering site. Some of the animals you will unearth are now extinct, but many are still around today.
The diversity of life then and now is staggering, but deciding on the animals was just the beginning. I wanted to be sure our visitors learned what it’s really like to be a paleontologist. With twelve years of field and museum preparatory experience under my belt, I felt I could work to make this element of the exhibit truly unique from other dig experiences.

Photo by iStock.com
Visitors will be able to explore the walls of the “pit” to see the sedimentary layers of rock that have been excavated. Fossil shipping crates will be in place with fossils being prepared to “ship” to the museum. Paleontologist field books will be on hand for visitors to learn more about the fossils unearthed at the site. Be sure to look up at the “surface” of the pit so that you can see all the tools a paleontologist uses at a dig site, too.
So, the next couple of months are going to be pretty busy. Shopping for “fossils” and casting them in cold-cast concrete in order for them to survive Rochester winters will be a huge undertaking.
I’m really excited about this project because it is where I will be able to put to use all the hours of lab experience I acquired earlier in my career. We will also be settling on the substrate, or matrix, that visitors will be digging in. While this sounds like an easy task, this has probably been the piece of the exhibit that has taken the most thought. Finding a balance between ease of movement, cleanliness, color, hardness, aesthetic principles and cost is an arduous task! Sieve stands are being constructed by an Eagle Scout to replicate those used at dig sites and shopping for props like shovels, pick axes, lunch boxes, gloves, etc. to set the stage are the final pieces to give our Dig Zone a truly authentic feel.
I am eagerly anticipating the chance to share this exhibit with our Zoo visitors. Being able to work on this exhibit has been a dream come true!
- Tina Crandall-Gommel, Conservation Education Coordinator





