Which one of the following is NOT a palaeoclimatic geological indicator?

Palaeoclimatic indicators, or proxies, are specific geological or biological records used to reconstruct past climates. Lacustrine (lake) deposits provide high-resolution data on local precipitation and temperature. Ice sheets and ice cores are primary indicators, trapping atmospheric gases and isotopes that reveal past temperatures and atmospheric composition. Evaporite deposits, such as salt, are critical lithological indicators of arid, low-latitude environments where evaporation exceeds precipitation. While sedimentary deposits encompass many of these indicators (like tillites or lacustrine layers), the term 'sedimentary deposits' itself is a broad geological category rather than a specific palaeoclimatic indicator. In the context of identifying specific proxies, sedimentary rocks are the medium containing the indicators (such as fossils or chemical signatures) rather than being a standalone climate proxy like the more specific options provided.

Sources

1. [1] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 7: Climate Change > 3. cryogenic/cryergic processes and global Warming > p. 12