What are the different colored horizontal layers that we see in this photo of a wall in the grand canyon?

The different colored horizontal layers that are present in the photo of a wall in the Grand Canyon are sediments that are deposited at different times in the past so that the oldest layers are at the bottom and layers near the top are the youngest.

Most of the Grand Canyon rocks are sedimentary. The Sedimentary rocks formed layers or strata above one another. Generally, Sedimentary layers are deposited in horizontal beds. The layers near the bottom are the oldest and layers near the top are the youngest.

None of the cross sections of the layers or strata can be seen except the inside of the layers is exposed by erosion. Each of the grand crayon sedimentary layers has a name and formed near sea level when most of the Arizona subsides.  

The sedimentary layers are classified as slopes and alternating cliffs. The alternating cliffs are more durable, they are well cemented limestone. Cliffs are formed by the combination of weathering and erosion; with weathering working on the upper and erosion wearing away the base.

The slopes consist of soft and eroded rocks such as mudstone, shale and siltstone.  

All Grand Canyon sedimentary rocks layers formed near the sea level either just above or below.

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horror and alarm

this is shown in the exserp then he beat at the door and called, but none responded, and for wrath he could have dashed the door down, but it was too stout, and he had no weapon; for his arms had been taken from him.when it was dark, suddenly it seemed to sir lancelot that the room smelled foul, as if he had been carried into the midst of the quaking marsh, and was sunk deep in the slime and weeds of a pool. then, through the arrow-slit, he saw many strange lights come, dim and blue like the wild lights that dance and flit over the lonely marshes by night; but that which made him   marvel was that these lights were two together, as if they were the eyes of evil things. and they came up to him with a breath that was cold and dank, and they seemed to peer into his face, but he could see naught of their bodies. the hair upon his head rose, and his skin went cold. they pressed all about him, and to defend himself he struck at the eyes, but his blows beat only the air. then suddenly sir lancelot felt sharp pains, as if small keen knives had been thrust into his flesh at many places. the stabs increased in number and in pain, and sir lancelot beat about himself and ran to and fro in the narrow chamber to escape   the evil eyes and the stabs, but it was in vain, and thus all night in much misery he suffered. when for sheer weariness he lay down and tried to close his eyes, the evil things would not let him, but ever they tore at him and stabbed him.