@article {6979,
	title = {On the zones of the Lower Lias and the <i>Avicula contorta</i> zone},
	journal = {The Quarterly Journal of the Zoological Society of London},
	volume = {17, part 4, No. 68},
	year = {1861},
	note = {PDFPls. 15, 16},
	pages = {483-516},
	keywords = {avicula contorta, stratigraphy},
	author = {Moore, Charles}
}
