is seated below the memorial marker 104 in an opening located on the interior end of the channel 110 as such the fastening device is not readily accessible by vandals or those who do not know the location of the fastening device fig3 a illustrates a detailed cross sectional view of the grave marker assembly 100 as shown in fig3 a the memorial marker 104 is attached to an upper surface 122 of the base 102 the base 102 has an opening 124 formed on a side edge 126 which leads to a channel extending inwardly from the side edge 126 an extraction slot 128 is also formed along the side edge 126 to facilitate extraction of the fastener 118 with a prying device as shown in fig3 b in some implementations the fastener is a fastening screw that is extended though the channel and received into an interior opening once the head of the fastening screw is securely seated in the interior opening the stem of the fastening screw is inserted into an opening 210 formed on the crypt lid 204 in other embodiments the fastening screw can be inserted into openings formed on other support structures such as a concrete block or the like fig4 shows a top view of the base 102 further illustrating the channels slots and openings configured to accommodate the installation and securing of the fastening device as shown in fig4 each channel 110 extends from a side edge 126 a 126 b to.