"The earth is one vast burial ground. Even the chalk deposits favoured by the early cave dwellers are composed of countless millions of primitive forms of life deposited in the dark morning of creation. These caves made by the natural course of water percolating through the cracks and crannies, provided shelter for the living and a sepulture for the dead. Here flint was found in abundance, from which rude tools were shaped. A number of such caves are known to existsome of which are even inhabited to-day."
The above was recently quoted by Canadian Cemetery History on Twitter. It picqued our interest. After a bit of searching the source of the quotation was revealed to be from a book titled "Funeral Customs", written by Bertram Puckle in the early 20th century.
Bertram Puckle authored two books, Funeral Customs: Their Origins and Development and Funeral Customs, which are listed on Good Reads. The first book is commercially available, the latter appears to be free to read online.
It's an interesting read so far (I'm at Chapter 6), with quite a few anecdotes about the way we were and the way we are still when it it comes to funerary practices. Here's the index linked to the chapters.