How did Mary Lyell contribute to Charles Lyell's geological work?

Mary Lyell, the daughter of a man with geological interests, was a vital partner in Charles Lyell’s life and work for 40 years. Their marriage was strengthened by her ability to actively participate in his scientific endeavors.1

Throughout their marriage, Mary accompanied Charles on his extensive geological explorations, traveling with him through Europe and Britain nearly every summer. Her involvement was not merely supportive; she shared his deep interest in geology and was his closest companion during his career. Her presence and partnership allowed Charles to maintain his rigorous schedule of research and travel, which remained a central focus of his life until her death in 1873.21