A tectonic block may have a proper name for example, the Muness Phyllite Block of Unst and Uyea, Shetland, or the South China Block.
A tectonic block may have a proper name, in which case block will have a capital "B". For example, the Muness Phyllite Block of Unst and Uyea, Shetland, or the South China Block.