Mg / Ca ratios in foraminiferal tests are routinely used as paleotemperature proxies. but on long timescales. they also hold the potential to reconstruct past seawater Mg / Ca. The impact of both temperature and seawater Mg / Ca on Mg incorporation in Foraminifera has been quantified by a number of studies. https://storeanimalwiz.shop/product-category/other-filter-parts/