BIOSTRATIGRAPHY: Age Dating & Correlation. GEOL 3213. GEOLOGIC TIME SCALE Know the: periods eras eons Ma: 1.6 65 251 410 544 2500 4000 4650. 201. 251. 4650. FORAMINIFERA. Simplified evolutionary chart based on wall structure 5 major wall types: Pseudochitinous Arenaceous
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Simplified evolutionary chart based on wall structure