Christina Negus

Tina Negus (born 1941 ) is a British zoologist, painter and poet who is credited as the original discoverer of Charnia, the first known Precambrian fossil. A fossil enthusiast since childhood, she found the first specimen of frond-like fossil at Charnwood Forest in Leicestershire during a summer vacation in 1956.

Negus studied zoology, botany and geography at the University of Reading. She took up zoology for her postgraduate degree and her dissertation on mussel diversity and abundance, published in the Journal of Animal Ecology in 1966, became a fundamental source of information on the degree of pollution in the River Thames. In recognition of her pioneering work, the University of Reading commissioned the Tina Negus Prize to graduate students of biology since 2019. Growing up in "Liassic (limestone sediments of Early Jurassic, about 200 to 180 million years old) sandstones and clays", as she described her upbringing, her childhood activities were mostly collecting fossils, and was familiar with ammonites and belemnites. by William Whitehead Watts, who had documented the Precambrian (roughly older than 530 million years ago) nature of the Charnwood rocks. This information inspired her for a field visit to Charnwood.

In September 1957, Ford had professional miners excavate the rock and extract the fossil for display at the Leicester Museum & Art Gallery (New Walk Museum and Art Gallery, prior to 2022). He reported the description in the September 1958 issue of the Proceedings of the Yorkshire Geological Society, drawing a conclusion: Several specimens of two new fossils recently found in the Woodhouse Beds of the Charnwood Forest Pre-Cambrian succession are described and named Charnia masoni and Charniodiscus concentricus... The evidence points to their being algae. Charnia masoni became the most iconic and first ever known Precambrian organism.

Negus's pursuit Not knowing that her fossil had been described and reported, Negus returned to Charnwood Forest in 1958, only to discover that the fossil had been extracted and disappeared. As soon as she entered the University of Reading in 1961, she took her fossil tracing to the geologist there for identification only to discover that her fossil had been described three years before. Her contribution to the fossil discovery was lost until 2004, talking about the discovery of Charnia on a television programme. which had remained one of the biggest puzzles in the history of life on Earth and the so called "Darwin's dilemma". In introducing the theory of natural selection in 1859, Darwin argues that the absence of such ancient lives was "the most obvious and gravest objection" to his theory.

Recognition of Negus's contribution Negus called up Mason and told him of her own discovery. Mason accepted Negus's priority, later declaring: "Tina Negus saw the frond before I did but no one took her seriously." In 2007, Negus's role was properly recognised at the seminar at Leicester University celebrating the 50th anniversary of Charnia discovery, where she was invited alongside Mason and Ford. The seminar ended with cutting of the "Charnia cake" by the three. She published her findings in the Journal of Animal Ecology in 1966,

In 2023, Ollard reported her investigation in the same Journal of Animal Ecology. The duck mussels had decreased to 1.1%, and the painter’s mussel, to 3.2%; while the rare species had completely disappeared. The alarming case was not only on the number, but also on the reduced sizes of the mussels, which is a scientific method of determining the deterioration of the Thames' ecosystem. The size and growth rates had reduced by 10 to 30%. According to Ollard, the policies on Thames conservation had prevented the total disappearance of the mussels and the stable, albeit critically low number, is an indication that the river ecosystem is improving.

In recognition of her pioneering work, the University of Reading commissioned the Tina Negus Prize to graduate students of biology since 2019.

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