Question

Over time, so-called “anomalous fading” reduces the observed signal strength of feldspar samples dated using this method. For 10 points each:
[10h] Name this dating method that is often applied to quartz through the single-aliquot regenerative-dose, or SAR, protocol. Techniques using this method date samples by dividing the equivalent dose by the dose rate.
ANSWER: luminescence dating [accept more specific answers such as thermoluminescence or radioluminescence or optically-stimulated luminescence; prompt on OSL or TT-OSL or IRSL or TL or RL or ISL by asking “What does the L stand for?”]
[10e] Optically stimulated luminescence is often used to date deposits of this sediment. This unconsolidated sediment forms namesake “fans” when it deposits onto floodplains.
ANSWER: alluvium [or alluvial deposit; accept alluvial fans; prompt on colluvium; reject “diluvium”]
[10m] Most alluvium comes from parent material of this geologic period. The Younger Dryas was a stadial that occurred during this period, while the clathrate gun hypothesis sought to explain interstadials during this period.
ANSWER: Quaternary Period [prompt on Q]
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Summary

2025 ACF Nationals04/19/2025Y246.2558%4%0%

Data

Penn StateArizona State010010
OttawaBritish Columbia0000
Chicago ANorthwestern010010
Cornell BColumbia B0000
Georgia StateWUSTL B0000
Chicago BGeorgia Tech010010
MITHarvard010010
IndianaNorth Carolina A0101020
Toronto CJohns Hopkins010010
FloridaLSE0000
Virginia TechMinnesota010010
NYUUC Berkeley B010010
VirginiaNorth Carolina B0000
RITOhio State0000
RutgersToronto A010010
StanfordIllinois A010010
TexasIowa State0000
Toronto BCornell A0000
MichiganUCF0000
Illinois BVanderbilt0000
UC Berkeley AWUSTL A010010
Columbia AWaterloo A010010
YaleWaterloo B010010
Winona StateMaryland010010