conversion question

I am following a stack up and the builder calls out 1 300 gram layer and 5 600 Gram layers. I assume it’s a square meter. What does this convert to in imperial weights ounce per square foot ?

Is there a chart available?

http://lmgtfy.com/?q=gsm+to+oz+per+yard

Are talking woven cloth or chopped strand mat? If woven cloth 300gm is 10oz and the 600gm is 18oz. If chopped strand mat it is 300gm 1oz and the 600gm is 2oz.