Stone architecture in Busick North Carolina

I found these 2 images in with older family photographs. My grandfather is from North Carolina (Old Fort) and I was told he built chimneys out of river rock quite often. I have no direct evidence that he built these 2 structures but it seems that would be the only reason why he had them. One is the Bostick home and the other is the Bostick Gas Station. Both in Busick North Carolina.