Here in central Pa. we find a lot of this material - Dauphin Co White, especially north of Harrisburg up the Susquehanna and Juniata Rivers. Shown her are 2 examples of the material, i've seen this chert used for just about every point type.
It's always nice to see the different types of materials and points different areas. I find a white silicafied sandstone type of material around here. You have some dandies there!