Earlier we posted about Queen’s Head, in Yehliu Geopark (https://www.facebook.com/photo.php?fbid=387670481294002&set=a.352867368107647.80532.352857924775258&type=1&theater). Yehliu also has many other geological treasures, including the Candle shaped rocks.
Candle shaped rocks are conical rocks with the top being narrower than the bottom. A round shape concretion containing lime formed on the central top of the rock and is surrounded by circular grooves, just like a candle tray.
The formation of Candle shaped rock involved three processes. The ‘candle light’ is the small ball shaped concretion within the rock layer. The concretion is harder than the sandstone which surrounds it so is far less susceptible to erosion by the sea; the concretion seems to ‘rise’ above the ground when the sandstone is eroded by the seawater. The grooves are formed when seawater flows around the concretions, eroding the surrounding sandstone. The candle tray itself forms in this way as well.