This figure has rock units and geologic features that are assigned letters that are not in any particular order.From the geologic relations,what is the oldest unit or feature of those listed below? 
Definitions:
Investing Activities
Part of a company's cash flow statement that reports the purchase and sale of long-term investments and property, plant, and equipment.
Gain
Gain refers to an increase in economic benefits or inflow of assets that result in an increase in equity, not related to contributions from equity participants.
Office Equipment
Assets like computers, desks, and chairs used in an office to carry out operations, not immediately consumed in the production process.
Depreciation Expense
The allocation of the cost of a tangible asset over its useful life.
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