I would say D the Billingsella Corrugata, it IS in the oldest recorded time line, so by theory, it's the oldest (Don't quote me on that, I'm not %100)
Explanation:
Well maybe because like cows do, some adventure off by themselves, and with younger cows they may forget where to head back. And if you think about it that leads to older cows which leads to new cow groups in different areas. Just like dinosaurs may have done.. Just a maybe
Answer:
A.Layer C is younger than layer A.
Explanation:
1, I want to say in the mid atlantic.
2. you use the scale on the bottom left to answer so it 1cm=405km.
3. I think you pick a line on the picture and that's the age, but I'm not to sure because I don't see a key. I hope this helps.