1. Using the sedimentary structures in the lab, fill in the chart below.

   Sample	Inorganic or Biogenic?	Rock Type	Describe the environment of deposition	Name of Sedimentary Structure
   1
   2
   3
   4
   5
   6
   7
   8
   9
   10
   11
   12
   13
   14
   15

   Online students see additional Sedimentary Structures exercises.

2. Matching

   	Sedimentary structure	Possible Environment
   _______ 1.	Mudcracks	a. turbidity currents
   _______ 2.	Stromatolites	b. dried up lake
   _______ 3.	Symmetrical ripples	c. glacial lake
   _______ 4.	Asymmetrical ripples	d. tidal flat
   _______ 5.	Graded bedding	e. river
   _______ 6.	Varves	f. wave-washed shoreline

    

    

    

3. Which of the sedimentary structures in this lab may be useful in determining paleocurrent directions? (List 4.) ________________________________

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4. Which of the sedimentary structures in this lab may be useful in helping determine the top from the bottom of a bed ("up indicators")? (List 4.) ________________________________

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5. Place an X in the table for the environments in which the sedimentary structure may form.

    

   Sedimentary structure	River	Shallow sea	Beach	Tidal flat	Dry lake bottom	Sand dunes (wind)	Deep Sea
   Laminations
   Asymmetrical ripples
   Symmetrical ripples
   Mudcracks
   Raindrop prints
   Cross- stratification
   Graded bedding
   Tracks
   Burrows
   Stromatolites

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