Ankylosaurian remains from the Late Cretaceous (Campanian) Santa Marta Formation of the James Ross Island in the Antarctic Peninsula include several types of armour. the most abundant being tiny. button-like ossicles (less than 5 mm in diameter). An histological study of these small ossicles evidences an original tissue structure. https://poolsproductscanadas.shop/product-category/jandy-sftm-sand-filter-parts/