On the zones of the Lower Lias and the Avicula contorta Zone Author Moore, Charles text Quarterly Journal of the Geological Society, London 1861 17 483 516 journal article CF32957B05FE4F809C1B95D30AA507FA CF32957B05FE4F809C1B95D30AA507FA Trochus nudus , new species This treatment is a stub. You can help Plazi making the full treatment available.