Monumental Sea Lily (Crinoid) Colony

Monumental Sea Lily (Crinoid) Colony

Seirocrinus subangularis

Early Jurassic Period (approx. 180 million years ago)

Upper Middle Epsilon Layer, Posidonia Shale, Holzmaden, Germany

A mass mortality of pyritized, golden sea lilies (crinoids) preserved in high relief, clustered and tangled in a huge, polished shale matrix. These large specimens have been meticulously prepared at the Urwelt-Museum Hauff in Holzmaden, Germany, rendering exquisite detail. The important segmentation and body outlines of these extinct creatures are displayed as they may have appeared in life, still anchored to their driftwood base.

A MUSEUM-GRADE MONUMENTAL SEA LILY COLONY PRESERVED IN POSIDONIA SHALE, ONLY A HANDFUL OF COMPARABLE SPECIMENS EXIST GLOBALLY, MOST HELD BY INSTITUTIONS

This monumental fossil mural features a complete colony of crinoids — marine invertebrates colloquially known as "sea lilies" — that lived 180 million years ago in the prehistoric Tethys Ocean that covered much of present-day Europe and Asia. Found in the world-renowned Holzmaden Lagerstätte, this uncommonly complete colony of crinoids on driftwood has been preserved in full three-dimensional articulation and prepared in the workshop of the Urwelt-Museum Hauff in Holzmaden, Germany.

Living almost their entire lives attached to the piece of driftwood seen here, these crinoids flourished in a rich underwater world alongside other marine animals including fish, ammonites, and belemnites. As sessile filter feeders, crinoids relied on the movement of the driftwood or floating debris to which they were attached to venture into areas with adequate food supply. Crinoids were nevertheless able to bend their stalks and flex and extend their arms — the five central appendages in their crowns — so that their mouths could face the water current to capture potential food.

Crinoids bred once a year when their eggs or sperm were released into the water. Once the eggs were released from the parent and fertilized, the resulting embryo would attach itself to a solid substrate such as driftwood where it would develop for several days into a barrel-shaped, free swimming larva. After several more days, the larva would reattach to the driftwood and develop a rudimentary stem, mouth, and five small arm-like tentacles known as podia. After several more weeks, the crinoid would reach the stalked, sessile stage, where it formed true arms, feather-like pinnules, and a complete set of podia that covered the pinnules and helped move food toward the mouth. After about a year of life, the crinoid would become fertile and produce either eggs or sperm, thus continuing the propagation of the species.

Eventually, these crinoids succumbed to death and became buried on the sea floor, where the low-oxygen environment allowed for their pristine preservation and fossilization. Over millions of years, the sediment and animal remains surrounding this crinoid colony petrified and became the dark grey Posidonia shale seen here, now famously extracted from the quarries of Holzmaden, Germany.

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Prepared at the Urwelt-Museum Hauff in Holzmaden, Germany. Documented, registered, and archived as Specimen #879.