However , an extensive study published in 2015 by a joint research team of England and Portugal concluded that `` Brontosaurus '' was a valid genus of sauropod distinct from `` Apatosaurus '' .
However , an extensive study published in 2015 concluded that `` Brontosaurus '' was a valid genus of sauropod distinct from `` Apatosaurus '' .
Sowerby published about 50 papers on molluscs and started several comprehensive , illustrated books on the subject , the most important the Thesaurus Conchyliorum , a work that was continued by his son , George Brettingham Sowerby II and his grandson George Brettingham Sowerby III .