Casts are actually thinner than the real piece most of the time. If you got to 1/4” that’s only about 25-30% thicker than the Sweetwater biface. Sounds like a lot but we’re taking mm. You’re piece is longer and wider too. Great job! You’re extremely talented and I know how much time you’ve put in perfecting your craft.

Jason it's amazing to watch you read the material and know exactly where to strike it and how hard to strike it you are truly a master excellent work.

“Probably a 6 inch flake” wow! I hope to be able to say that one day, you’re awesome

You are amazing .... One of the best rockdoctors Ive ever watched ..... and I could watch you knap for as long as you could do it comfortably . I enjoy watching someone that can read a rock and make something so fragile and beautiful . I would love to have one of your blades like this ...please pm me and give me an idea if that is possible . I learned how to knap 5 years ago and then had to have 6 spinal fusions ,2 in my neck and 4 in my lower back , and after having the bones at the back of my neck removed , I can no longer look down for more than 10 minutes before the pain and pressure builds to where I get nauseated and have to lay down and take weight off my neck ...so ...from owning two in home business es for 23 years and being super active to 16-18 hours a day in bed , makes for no more knapping ...I even made jewelry for sale with the small items ...hearts , arrow heads , and feather earring/necklace / bracelet sets ...sold many but enjoyed the joy they brought to others more than the monetary end of it ... Hopefully I will hear back from you Jason ....you are an amazing knapper , to put it mildly ! May GOD continue to richly bless and keep and yours ...!

You are really amazing! I love watching you work and have learned a lot from your videos. I wish I could find a community of knappers to interact with. It is a steep learning curve on my own.

Dude, you are F-ing unreal. Super work.

Thanks for pointing out when making a narrower blade. results with more Width in the end. on how to deal with those issues building up in the center. @27min. Good to see you back thanks for making time to share your amazing skills

Amazing work! Your videos are very entertaining and educational. Thanks for taking the time to share this.

Great work! Any paleo tribe would happily have you! You would be a magician!

Your amastet knapper jayson you trily are and a perfectionist. Thank you what pleasue wathing you do the magic you totaly know what your doing THANK YOU ONCE AGAIN FOX NO EARS

Great knapping. If there’s anyone who’s gonna make another sweetwater biface, it’s you. Cheers

Wow,that is just awesome getting it that thin.Great Job.

Great video Jason. Impressive blade. Enjoyed the visit yesterday. Sure hope to see you at Nibletts in the fall....Keith

love watching your videos! tip for videoing turn your phone on airplane mode and turn phone horizontal while recording, will give full screen. these are excellent knapping videos you are a true master of your trade! keep them coming.

Pretty good knapping technique...Excellent phone etiquette.

Damn man that is killer work! I cant seem to get a decent bi face from the obsidian I have, i keep getting hinge breaks, don't know if it's me or the material, but I'll keep makin little rocks out of big ones😁

Did I hear you right? Gonna get boring in a minute. Watching you work your magic is never boring.

Awesome work in progress!

That wasn't boring at all. That's the shit I like.

I noticed you abrade less than anyone Ive ever seen and still have great results. This leads me to believe that most people over abrade, or it has something to do with your use of solid copper billets and/or your method of how you appear to be creating a "bending" flake as opposed to just striking the platform.

Great video Jason! I hope I'm not missing out on watching you chip away because I'm not on facebook.

Wow fabulous dude 👏

I missed this one.

This is ridiculously impressive!

Amazing work , You do make it look easy ,

That thin, hollow sound would would terrify me!

Thank for taking the time to put the video on

I would be interested in purchasing some of your larger flakes ... I can still shape and pressure flake some , just unable to break the rock myself anymore .. I want one of your most excellent points ...which is everyone I have seen you make so far ...been watching you for 4 years ...

Nice work Jason. I was relieved when you said you were gonna stop. Masterfully done. Does the rock dry out any if you leave it alone for a few days? Thanks for posting.

Dude, you are good.

Damn! Full all out Anarchy on that GT! My kind of guy! btw: im far from bored.

Great work Jason, it is amazing to watch you work that rock. It would be more amazing if it were in higher resolution, not putting you down just would love to see you do your work more clearly its so wonderful. Either way keep it going.

Talk about thin! That’s amazing.

That is crazy thin.

Damn close, I hope you’re the guy that succeeds.

So incredible! What do you have on the top where you strike the rod? Some kind of rubber?

Looks awesome to bad about the crack still a fantastic piece

Very well done! In regards to the Sweetwater and other ultrathin bifaces from prehistory, what are your thoughts on tools/methods used by the authors of these original pieces? I've sometimes wondered if there weren't teams, one guy holding the biface, one holding the indirect tool, and one striking. Or maybe it was one guy doing the most incredible direct percussion imaginable. Regardless, it's fun to think about and neat to watch you work.

Man I'd love some of that debitage

i wish i had big flint

Man, I wish we had nodules like that in Colorado.

Getting closer!!!

Great job Jason how much you charge to make a Cumberland? About one inche wide 4 inches long

I've seen casts of the Sweetwater blade and pictures of the blade itself, the cast always seem thinner, I guess it's due to shrinkage from the curing process.

I hope that some day I can biface half as well as you do!

This material heat treated? And if so how well dose it work when it's not?

Where do you get all that beautiful chert/flint? I love hearing the smack and then the Kachink.

I step fracture and hinge the dickens out when I try to flake from a spall, do u hammer straight down on the stone and the stone flat, or is there a angle

You do some good work

Pretty freakin' close, man. Given greater width, I'd say you probably reached equivalent level of blade??

Jason I have a question about your aluminum billet What is the alloy and what is the length and diameter I am a subscriber and you are a great flint knapper

Are you ever gonna chase it again?

Amazing talent Jason, you are truly blessed. What part of Texas are you in? Do you gather your own knapping material or buying it?

Get er done

i wish i had that big flint sorry

Where are you from Jason?

Man I’d love to buy some of those beautiful Georgetown spalls you’re knocking off that bad boy. Any chance?

Do you sell any spalls