Tartu, Estonia — Today Bill Ausich and I began our work in the University of Tartu Natural History Museum. Our most knowledgeable and helpful host is chief geology curator Mare Isakar. This museum is just a short walk from our hotel.
One of our goals is to study encrusters on specimens of the nearly spherical Late Ordovician rhombiferan echinoderm Echinosphaerites aurantium. Mare Isakar kindly set out dozens of specimens for us to study, a small subset of which is shown above.
One of the encrusted Echinosphaerites skeletons. The black, branching, carbonaceous encruster is the graptolite Thallograptus sphaericola (“sphere-dweller”).
Posted in the museum is this figure by Öpik (1925) showing his idea of an Echinosphaerites community with encrusting graptolites. We want to test his hypothesis that the graptolites encrusted living rhombiferans as shown. My hypothesis is that the graptolites lived instead on dead, cemented skeletons. Armin Aleksander Öpik (1898-1983) was a prominent and productive Estonian paleontologist. Like many Estonian scientists of his generation, his career was bifurcated by World War II.
Several characters from Estonia’s scientific past watched us work. This is Constantin Grewingk (1819-1887). Ohio paleontologists will recognize him as the namesake of the rugose coral Grewingkia.
The public part of the museum includes this exhibit on “Secrets of Ancient Sea”. You may recognize some familiar Ordovician characters in this scene. Bill and I intend to visit the public exhibits here on Sunday.
Thank you again to Mare Isakar for setting us up so efficiently for our research!