module b Flashcards
stratigraphy, lakes and bogs, oceans
what is sediment?
any mineral or organic matter deposited by air, water, or ice
what is strata?
sediment that builds up in horizontal layers
horizontal layers over time form a…
stratigraphy
what is the law of superposition?
layers on the bottom are older than the layers on the top
understanding that older layers are below younger layers is called…
time-depth relationship
a change in color, material, or compaction signals…
environmental change
oxygen isotope studies tell us…
when the weather changes (warmer vs colder)
all glacials and interglacials before the holocene are called…
pleistocene
quaternary=
pleistocene+holocene
what is a subfossil?
dead, organic material that has been preserved in conditions that prevent decay
subfossils are often found in…
lakes and bogs
what term refers to the factors that affect subfossil assemblage?
taphonomy
material that grew where sediment accumulated is called…
autochthonous
material derived from a distance is called….
allochthonous
the study of lake sediments for reconstructing past environments is called…
palaeolimnology