ELECTRONIC	h   t   t   p   c o l o n   s l a s h   s l a s h   w   w   w dot s t r a t i g r a p h y dot o r g   s l a s h   g   s   s   p dot h   t   m	h   t   t   p   c o l o n   s l a s h   s l a s h   w   w   w dot s t r a t i g r a p h y dot o r g   s l a s h   g   s   s   p dot h   t   m	1