108-year-old core sample from Indianapolis Motor Speedway track - photo

[Jon]

It looks like this core sample was taken two days ago, on October 27th. Here's the original tweet about it:

https://twitter.com/jdouglas4/status/923938575388995584

The sourcing is pretty good here. The Twitter account, jdouglas4, is J. Douglas Boles, the president of Indianapolis Motor Speedway.

[Frank S]

Using the link Jon provided https://twitter.com/jdouglas4/status/923938575388995584
we can learn from Eric Powell's tweet
It’s like rings on a tree. “And here’s the 2004 repaving ... 1988, 76, 61, some tar added 1930s, 1909, etc. Living history!

[Cascao]

It was told me once that on no aggregate asphalt it is easier to control side slippage.