20-30 BIG split logs buried horizontally one foot underground with yellow black green arrows pointing in the same direction then 45 degree angle to a 100 foot tree now cut down. pre war in Davao near a river. used to be amphibious craft bogged down by the river now gone. Japanese used to visit taking photos of kittens in backyard by the river. but the tree reference was gone so they were confused by the houses. any inferences anybody knows about logs with arrows? land is single owned since before war to the present. logs never dug up still in the ground. 6-/40 investors? carpenter who was making a walkway found it ca. 1964. no photos taken that I know of. credible witnesses still alive.