Final answer:
The Ediz Hook likely formed from sediments originating from a set of metamorphic rocks to the west and a set of granites to the south, with analysis of sediment age and composition being key in determining their contributions. Oysters align with marine environments, and shifting sediment sources can result from environmental changes like retreating ice sheets.
Step-by-step explanation:
The correct sources for sediment that contributed to the formation of the Ediz Hook are likely a set of metamorphic rocks to the west and a set of granites to the south. By analyzing the sediment collected (biotite grains) and determining its age, one could deduce which source rocks the sediment came from. In general, metamorphic rocks may have distinctive mineral assemblages and age characteristics compared to granitic sources. Examining the texture and composition of the sediment, as well as its spatial distribution, would offer clues about the dominant processes at work and the relative contribution of each source.
Oysters are typically found in a marine sedimentary environment, indicating a nearshore, shallow water habitat where they can thrive. Identification of such environments aids in understanding sediment sources and transport mechanisms.
When dealing with changing environments, such as a retreating ice sheet, the exposure and erosion of different rocks can alter the sediment composition in depositional areas. Changing climate and sea levels influence which source areas become more abundant in contributing sediments to a particular site.