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  1. Figure 6.21 Formation of cross-beds as a series of ripples or dunes migrates with the flow. Each ripple advances forward (right to left in this view) as more sediment is deposited on its leading face. Graded bedding is characterized by a gradation in grain size from bottom to top within a single bed.

    6.4 Sedimentary Structures and Fossils – …

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    The picture on the left shows ancient sanddunes with cross-bedding. GRADED BEDDING means that the grain size within a bed decreases upwards. This type of bedding is commonly associated with so called turbidity currents.

    Sedimentary Structures - IU

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    What is a graded bed?
    Because graded bedding forms as suspended grains settle from a turbidity current, the heaviest grains tend to settle out first, and those tend to be the biggest grains. A graded bed therefore has the largest grains at the bottom, and then they gradually get finer toward the top of the bed.

    61.2: Sedimentary way-up structures - Geosciences LibreTexts

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    What is the difference between cross-bedding and bedding?
    Bedding is defined by differences in colour and texture, and also by partings (gaps) between beds that may otherwise appear to be similar. Cross-bedding is bedding that contains angled layers and forms when sediments are deposited by flowing water or wind. Some examples are shown in Figures 6.1, 6.8b, and 6.20.

    6.4 Sedimentary Structures and Fossils – Physical Geology

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    What is a graded bed in geology?
    In geology, a graded bed is a bed characterized by a systematic change in grain or clast size from bottom to top of the bed. Most commonly this takes the form of normal grading, with coarser sediments at the base, which grade upward into progressively finer ones. Such a bed is also described as fining upward.

    Graded bedding - Wikipedia

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    How does grain size change between graded beds?
    This change in grain size within the bed is transitional and gradational, but the contact between graded beds will typically be quite crisp – a sudden switch from the fine grains at the top of one graded bed and coarser grains at the bottom of the overlying bed.

    61.2: Sedimentary way-up structures - Geosciences LibreTexts

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    What does cross-bedding mean?
    Cross-bedding (or cross-stratification) is a primary sedimentary feature characterized by layers that intersect at an angle with each other through planar erosional surfaces that truncate inclined beds and laminae.

    Cross-bedding - Geology is the Way

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    What are the characteristics of cross-bedding?
    In general, cross-bedding is characterized by planar erosional surfaces that separate beds with inclined strata or laminae. This architecture is the result of the migration of bedforms, such as dunes, ripples, and megaripples, produced by wind or water currents in sand-rich…

    Bedding and lamination – Geology is the Way

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      61.2: Sedimentary way-up structures - Geosciences LibreTexts

    • Images of Graded Bedding Vs Cross Bedding

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      Bedding and lamination – Geology is the Way

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      Graded bedding - Wikipedia

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      6.4 Sedimentary Structures and Fossils – Physical Geology

      Sep 1, 2015 · Graded bedding is characterized by a gradation in grain size from bottom to top within a single bed. “Normal” graded beds are coarse at the …

      • Author: Steven Earle
      • Publish Year: 2015
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      Chapter 4: Sedimentary Structures – The Story of Earth: …

      Graded Bedding. Graded bedding is a common sedimentary structure where a change in grain size can be observed within a single sedimentary bed (Figure 4.9). At the bottom of the bed are mainly coarse particles which get …

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      Way-up structures – Historical Geology

      Dec 31, 2019 · These include cross-bedding formed by magma flowing through a crystal mush, and graded bedding that results as crystals settle out from a cooling magma. The key here is that in a partially crystallized magma …

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      Cross-bedding - Geology is the Way

      Cross-bedding (or cross-stratification) is a primary sedimentary feature characterized by layers that intersect at an angle with each other. In general, cross-bedding is characterized by planar erosional surfaces that separate …

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      Sedimentary rock - Stratification, Fossils, Bedding

      Examples include bedding or stratification, graded bedding, and cross-bedding. Sedimentary structures that are produced shortly after deposition and as a result of compaction and desiccation are called penecontemporaneous …

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      Grading, graded bedding | SpringerLink