The primary rocks are Quartzite overlaid with an irregular slaty formation. The pileated woodpecker normally is brownish-black, smoky, or slaty black in color. Most of this is slaty shale and mudstone. The upperside and breast are slaty blue grading to grey on the flanks. Most of Amaroo is based on slaty shale and mudstone. The colour is light brownish and the pupa is embellished with slaty irrorations. In Charnwood Forest also, the tuffs are slaty and cleaved. The foliation in slate is called "slaty cleavage". The forests are also important for great slaty woodpecker and white-naped woodpecker. In breeding plumage, it has a slaty black hood, which it loses in non-breeding plumage. The slaty egret lives in south-central Africa. Locally, the great slaty woodpecker prefers sprawling stands of dipterocarp and teak trees. The resulting slaty cleavage is parallel to the axial plane of regional folds. Also they mostly have a slaty cleavage. The great slaty woodpecker ("Mulleripicus pulverulentus") is a species of bird in the family Picidae.