A cousin found this coiled Silurian cephalopod in the Louisville Limestone last week. I think it is about 10 cm in diameter. Wow, I only find orthoceras (straight) cephalopods and even then they are rare finds in the Silurian rock. This one was found in Louisville, Kentucky USA.
This one might be a Lituites marshi (Hall) shown on Plate XXX Figure 1 in the 1889 Kentucky Fossil Shells - A Monograph of Fossil Shells of the Silurian and Devonian Rocks of Kentucky by Henry Nettelroth (1835-1887) at this University of Kentucky website (www.uky.edu/OtherOrgs/KPS/books/nettelroth/files/nettlerothplates.pdf).
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhmTtTtpDgqchdtghuh4XkQ-HC7gu_W7sveElVO8_BBT_ryS8vREvJ1yGTiWK5jQgYq49VZW2tvMmhn-dJNkuhkk8y5HBtUrkCuIu9eJpGdvkdbXea69ICh91bRD2cOli8YZNQJo0FItQdo/s400/silurian-coiled-cephalopod2.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjW9X4ye-1aIl2-wNNlTN3EXf_Zfyc0jvrdiZ_69t7QxA5you8sER2_Cw6K5uDIzGFgBEqWQJvyttnIEM172_cR1Fx6EV307_DOFBd44CPfI2ku9N75aDYrLlLuy972wl5OWPqcG47xEfr2/s400/silurian-coiled-cephalopod.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjicNVlhAo67mTcR7XhwPXFliG-Om-VSpd6MZUfGYUvURfERYbxVXbger5VK0cURFV5ABwxwTU-KTh-CVHRE8uarCnCVd0zvSm8P_s7qFoC_cgcAov41JAIDice2qlr3_ejAO5ohfzbRoUI/s400/coiled-ammonite.jpg)