BURLINGTON, Iowa (AP) — Iowa lawmakers could choose a 500-million-year-old species known as a crinoid as the state’s officially recognized fossil. Geologists have called Burlington the “crinoid capital of the world” since its home to more than 300 species, which are similar to starfish or sea urchins. The Hawk Eye reports that a resolution to establish the crinoid as the state fossil was introduced in the Senate by seven Democrats last week. The resolution says the crinoid has contributed to Iowa’s history and economic benefit, including “a significant portion of lime deposits” that has been used for roads, agriculture, building and raw materials.

If approved in the Senate and House of Representatives, the crinoid would join Iowa’s Official Register along with other state symbols, like the goldfinch, rose and oak tree.