Purple Mountain (Kerry) metres. Purple Mountain (Kerry) Purple Mountain () at high, is the 21st–highest peak in Ireland on the Arderin scale, and the 28th–highest according to the Vandeleur-Lynam scale. Purple mountain is the highest peak of the Purple Mountain Group, and is located in County Kerry, Ireland. Purple Mountain is composed of sandstone particles of various sizes which are collectively known as "Old Red Sandstone". Old Red Sandstone has a purple-reddish colour, and has virtually no fossils. The colour gave its name to the mountain group. The composition of "Old Red Sandstone" is variable and contains quartz stones, mudstones, siltstones, and sandstone
Purple-backed fairywren ear tufts are prominently featured in breeding displays. The male in breeding plumage has striking bright blue ear coverts and blue-purple crown and forehead, a black throat and nape, a blue-purple upper back, chestnut shoulders and a bluish-grey tail. The wings are drab brown and the belly white. Within subspecies "assimilis", the plumage of both sexes is becomes paler from east to west across its range, with those of northwestern Australia paler still. Non-breeding males, females and juveniles of subspecies "assimilis" are predominantly grey-brown in colour, while those of subspecies "rogersi" and "dulcis" are mainly blue-grey. Males of all subspecies