Two drawings of a crib wall. One looking into the hillside and the other is a side view entitiled 'Crib Wall'.

The top image of the crib wall viewed looking into the hillside:

• An arrow points to a drift pin in the top log and is labeled with the text '15-mm (1/2-in) drift pins to penetrate three logs (min.)
  
  
• An arrow points to a log that is on the outside of the crib wall and is labeled with the text 'Face logs'.
  
  
• The logs in between the face logs are show with an arrow and labeled with the text 'Filler logs'.
  
  
• The distance between the first and third set of logs that are not face logs is marked with arrows showing the maximum distance apart. It is labeled with the following text: '2.5 m (8 ft) (max.) spacing'.

The bottom image of the crib wall's side view:

• The 'Trail tread' is labeled at the top and a dotted line shows the original slope of the hill.
  
  
• The 'Trail bed' underneath the crib wall is shown with an arrow.
  
  
• The logs closest to the hill are shown with an arrow and labeled 'Notched rear logs'.
  
  
• The logs on the outside of the crib wall are shown with and arrow and labeled 'Notched face logs'.
  
  
• The logs in between the face and rear logs are shown with and arrow and labeled 'Notched header logs'.
  
  
• The filler logs are in between the face and rear logs also but are on the outside of the crib wall where the face logs are. They are shown with an arrow and labeled 'Unnotched filler logs'.
  
  
• The batter is labeled with the text 'Batter' and shown with a triangle showing the slope of the crib wall.
  
  
• The logs at the bottom of the crib wall are shown with an arrow and labeled 'Unnotched sill logs'.