Fossil data

What could be more fun in our house than a giant zip-top plastic bag crammed full of fossils??

Obviously a rhetorical question – because NOTHING could be!

We ordered this fossil sorting kit from Educational Innovations. When it came, the first thing we did was immediately look at the sorting guide. L took the lead on separating all of the fossils into their different types.

Sorting

Sorting

Once we sorted them, we counted how many of each type we ended up with. We’ve been talking a lot about the idea of data, so this seemed like a perfect moment to pursue that concept. It provided a nice moment to think about groupings by 10’s (and with crinoids, even 100’s!)

Counting ammonites

Counting ammonites

Crinoids in tens and our data capture

Crinoids in tens and our data capture

We talked about how to represent the data and decided to graph it. I asked her how many boxes we would need to fill in to show 158 crinoids. She grasped that 158 boxes was going to be a lot!! For the first time, we went to the computer to pursue our graph. We logged onto the NCES Create a Graph feature. We chose a bar graph and L entered all of the data herself. It created the following graph:

L's graph

L’s graph (note the headers’ spelling!)

We’ve also been talking a lot about multiple ways to interpret the same dataset, and given L’s interest in evolution and time, we decided to re-analyze our data by time. We began by finding and printing a geologic timeline. We then cut out the information about each of the fossils and attached them where they belonged on the timeline.

Fossils in time order

Fossils in time order

Finally, I wanted to stretch her thinking into the logical and organizational realms. We wrote the three periods the fossils were found in (Devonian, Jurassic, and Cretaceous) in black marker. I then asked L to identify her favorite events in Earth’s history. We wrote those in blue marker. She then went through the work of ordered the blue events on our kitchen floor.

Sorting events

Sorting events

Once the blue events were in place, she placed the period markers at their appropriate locations (under the line to differentiate the periods from the events). Finally, she placed one of each fossil in the timeline as well. Here are the two parts (she wanted a big delineation between the Devonian and Jurassic, so they were about 10 feet apart):

Timeline, pt 1

Timeline, pt 1

Timeline, pt. 2

Timeline, pt. 2

Overall, this was a great hands-on synthesis of one of her favorite subjects with some higher-order thinking. I love it when her “work” feels more like play. Her brain was engaged, but so was her body and her giggle!

introducing evolution

L asked the other day, “Why did some dinosaurs evolve and others go extinct when the meteorite hit?”

Great question! One answer is, “I have no earthly idea!” but I feel as if she’s looking for something more detailed than that. I got to thinking that the answer to that question really encompasses the idea of adaptations, environments, and a little bit of luck, too. I’d been contemplating when to really start the discussion of evolution with her, and it seemed like the time was upon us.

She knows that birds are modern dinosaurs. She also knows (from an exhibit at the museum) that certain beaks are better for some tasks than for others. I decided to use the bird beak adaptation lab as an entry point into this discussion.

I consulted a number of examples of this lab online and eventually merged some ideas from many of them into our lab, which took place this morning.

I prepared the materials and laid them out on our kitchen table:

5 beaks

5 foods

I then asked L to make predictions about which beak would be best at eating which type of food, after making sure she understood that one beak went best with one food. The circles represent those predictions that were supported with evidence (we revisited after the lab was complete) while the X’s represent those predictions for which we found no evidence.

initial predictions

 

We then created a chart listing the beaks down the side and the foods (what they actually were and what they represented) across the top. She then selected a beak and proceeded to try each food with that beak. She told me her observations and I recorded them in each cell. Once we finished all five trials with a beak, we used the purple marker to cross out those foods for which the beak simply didn’t work. When we figured out what food the beak was perfect for, we outlined that cell in blue. Once we outlined a cell, we used the orange marker to cross out those remaining cells for the beak. I wanted to present her with the difference between eliminating a choice through observation and eliminating one through the process of elimination.

the completed data chart

We then wrote out our conclusions. She’d already stated that the straw drinking the nectar was a hummingbird while the tweezers getting the insects out of the wood must be a woodpecker. In our conclusions, we also included the/a type of bird that had a beak similar to the tool we used.

conclusions

So cool!

She then mentioned how a hummingbird couldn’t live in the ocean. I asked her why and she stated that there are no nectar-filled flowers in the ocean. This seemed like a great time to talk about adaptations and natural selection, so we started with oceans, hummingbirds, and pelicans:

adaptation to ocean eating

From there, it seemed like a quick jump to natural selection and the creation of adaptations, so we talked about hummingbirds. I asked her, if a hummingbird had a choice to mate with a hummingbird with a short beak or one with a long beak, which would the hummingbird choose? She told me that the hummingbird would choose the one with the long beak because that one would be better at getting nectar. Exactly! We talked about how their baby would have a long, skinny beak too (although traits aren’t 100% heritable, this didn’t seem like the time to introduce that!). I drew a second generation and posed the same question. She again chose the long, skinny beak. She them told me, “So the hummingbird beaks just keep getting longer and skinnier!” Precisely, small human. Precisely. Here is my written record created through that conversation:

hummingbird natural selection

This launched a great many more questions, most of which I didn’t have great answers to! So, off to our local independent children’s bookstore we went! We came home with a few texts. The one we’re reading first is Did Dinosaurs Have Feathers? by Kathleen Weidner Zoehfeld. She’s started reading it aloud and is about a third of the way through. This book does a nice job of introducing the direct relationship between modern birds and dinosaurs (theropods specifically). As we finished our reading today, L told me that she rejects the distinction between theropods and birds. In her mind, the features are so similar that the difference is one of language, but not of features. She told me that “we know that birds are living dinosaurs” (that part wasn’t new information). What was new, though, was her addition that “theropods are ancient birds.” Makes sense to me!

And now we are at ballet class where I hear her yelling, “This is like speed and velocity!”

Nutty little girl. Love her so much. Thanks for reading.