These are indeed Graptolites. Climacogaptus is the most commonly found Graptolite in this area. Ben, you might consider joining the Dry Dredgers if you are collecting in this area. We have a member who is an expert on Graptolites and can help identify your specimens. I have a photo of one of these in the Fossil Photo section of this website. This specimen was found loose in the mud so is three dimensional.