Final answer:
The age of the red layer can be estimated using radiometric dating and stratigraphic principles such as the principle of superposition and fossil examination.
Step-by-step explanation:
The age of the red layer can be determined using principles such as radiometric dating, geologic time scale color-coding, stratigraphy, and archaeological stratification. Based on the principle of superposition, if the red layer is found below other strata, it is considered older than the layers above it. When this information is combined with radiometric dating, which measures the decay of radioactive materials to determine the age of the rocks, it is possible to calculate the exact age of the red layer. Also, by examining the fossils within the sedimentary rock layers, geologists can label the geologic periods and gain further insight into the age of the layer.