What are Fossil Graptolites, and why are they useful in geology? 

Thank you for the video! Keep going!

Great video. Found a specimen in Utah stuck in some sediment that had settled inside the cavity of an intact silicified horn coral. It's my favorite horn coral because of that.

Thanks for the video!

odd that the critters near "deep sea vents" are so similar to something found in carbonaceous shales.. would seem to indicate we might not want to connect two organisms in such radically different environments too quickly.

I like this.

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-6fejAmSlZ0g.html Paleocast interview with a graptolite specialist. He talks of the best preservation being a rubbery fossil, 3-D, still flexible, extracted by acid from concretions. Weird-beard! Love your lectures. U are brave to wade through all that Greek and Latin. Really enjoyed your interactions with Aron Ra. Small world to see you talking and exchanging info. I'd love a round-table with you 2 and Dr David Eberth from Tyrell Museum, Alberta, focused on paleo-environments...the big picture; diversity and interactions. Graptolites in the modern setting...hemichordata appear to be sulfur-tolerant and able to live in low oxygen environments. Could they be a sulfur indicator or a low oxygen indicator? Their preservation in calcareous shales indicates a low oxygen taphonomy. Could it also be a low oxygen living niche...at least for some?

Do the graptolite dance 👐