Final answer:
The stone's description, with its carved symbols and the concealed hole beneath, enhances the story by adding depth, intrigue, and a pivotal plot point that keeps readers engaged and curious about the ensuing adventure.
Step-by-step explanation:
The description of the stone uncovered by the characters Jasper and the narrator does indeed support the plot of the story. The stone adds a layer of mystery and intrigue, which is a crucial element in storytelling. It engages the reader's imagination, prompting them to visualize the surroundings and anticipate what might lie beneath, thereby enriching the story experience.
The discovery of intricate symbols carved into the stone suggests a historical or cultural significance, adding depth to the narrative. Moreover, the subsequent revealing of a dark hole with a ladder after lifting the stone significantly builds suspense, hinting at an underlying adventure or discovery waiting for the characters. This element not only stimulates the reader's curiosity but also propels the plot forward by introducing a new, unexpected dimension to the characters' hike.