Blocks
Fossiliferous Dirt is a new Block that can be brushed. It can be found in various fossil-specific structures. Once you've found some, you may uncover fossil parts to collect!
Rotten Wood is found in structures as old as time itself. Who would have thought that the wood of trees long gone would survive this long? Rotten Wood drops sticks if broken without silk-touch.
BetterArcheology relies heavily on the use of mud bricks, which is why there are new additions to the existing few, such as cracked or Silverfish infested ones.
The Evoker Trap is a block that is added for Creative use and structure generation only. On activation via Redstone, it will spawn 3 evoker fangs in the line it's facing. As of now (V 1.0.0) it is only used in the enhanced jungle temple structure.