Siliciclastic Collection
Siliciclastic sediments, as depicted in the series of pictures numbered 12020177 to 12020188
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Siliciclastic sediments, as depicted in the series of pictures numbered 12020177 to 12020188, offer a fascinating glimpse into the geological processes that shape our planet. These sediments are composed primarily of fragments derived from pre-existing rocks and minerals, which have been weathered, eroded, transported, and deposited over time. In Picture No. 12020177, we see a close-up view sediment grains under a microscope. Their angular shapes indicate that they have not undergone much transport or rounding during their journey through rivers or wind currents. This suggests that these sediments were likely deposited near their source area. Moving on to Picture No. 12020188, we observe layers upon layers sedimentary rocks stacked one above the other. The distinct banding patterns reveal episodes of deposition followed by periods of erosion or non-deposition. Each layer represents a snapshot in time capturing the changing environmental conditions throughout Earth's history. Picture No. 12020187 showcases cross-bedding within siliciclastic sandstone - an intriguing feature formed when sediment is deposited at an angle due to wind or water currents before being lithified into rock. This phenomenon provides valuable insights into ancient environments such as deserts or river channels where these deposits were originally laid down. Continuing with Picture No. 12020186 and its depiction of ripple marks preserved in fine-grained silts and clays; these delicate features are evidence of past fluid flow across loose sediment surfaces like those found in shallow marine environments or river beds. In contrast to finer-grained sediments seen earlier, Picture No. 12020185 displays coarse-grained conglomerate rocks containing large pebbles and cobbles cemented together by finer material known as matrix. Such deposits typically form in high-energy environments like fast-flowing rivers or alluvial fans where larger particles can be transported more easily. Picture No.