As better tools became available the Colonial builders became adept at working the extremely hard and durable timber of the native hardwood forests. The majority of houses were built of split logs rather than sawn timber. The technique employed for the construction of a wall was to chisel out a deep groove in a straight log, preferably of the local termite-resistant Cyprus pine which became the foundation. Split logs that had been adzed flat at the ends were then stood in the groove and another groove log was placed on top and slotted into place in a circular corner post. The gaps between the split logs were either packed with clay and animal hair or had narrow strips of metal cut from kerosene tins tacked over them. The interior could be plastered with clay, lined with paperbark or papered with newspaper, wrapping paper or calico. Cards, photographs, news clippings and commemorative items were often stuck directly onto the walls.