Aptian jetstone tree trunk

[TStanev]

First of all, hello everybody! This is my first post!

 

Need some help with identification of a tree jetstone, site is an Aptian quarry, in north central Bulgaria.

During few visits and alot of digging I managed to recover few chunks of a tree stem or a branch turned into jetstone.

Can you help me identify the type of flora I have?  I couldn't find much information online, and I don't have proper flora paleontology books. 

Attached photos below.

Thanks!

 

P.S. First 3 chunks i have treated with b72, the bigger ones are still natural condition.

Also i have found some ammonites in the same quarry, might attach photos of them if whould help.

 

 

 

[Fossildude19]

JET

 

"ORIGIN:

Jet is a product of decomposition of wood from millions of years ago, commonly the wood of trees of the family Araucariaceae.^[5] Jet is found in two forms, hard and soft.^[5] Hard jet is the result of carbon compression and salt water; soft jet may be the result of carbon compression and fresh water.^[5] Despite the name they both occupy the same area of the Mohs scale with the difference being that soft jet is more likely to crack when exposed to changes in temperature.^[6]"

 

Pretty sure you can't say much more than "Trees of the family Araucariaceae."