Cup or calyx of the crinoid Dolatocrinus
scale in cms
The main body portion of the crinoid animal is sometimes called the cup or calyx. The arms and stem attach to the calyx (stem attachment is the circular mark in the center of the specimen above). Many of these crinoid cups are found severed from the stem and flipped upside down, such as this one. Why? Maybe these crinoids couldn't withstand the pull of strong bottom currents (like those generated during tropical storms or hurricanes) and the large cup broke away from the anchored stem portion of the body. Similarly, people who sail boats must use smaller sails in strong winds to prevent their boats from tipping over.
Look at additional fossils from Kashong Glen.
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