To log this Earthcache is a simple matter, Just answer the following questions:
1. The tide comes in and out twice a day. If there was no tide, what would happen to this area?
2. When you were at the mudflat, it could have a peculiar smell, what does it smell like?
3. Was the tide in or out when you were here? If out, was there anything of significance on the mud? If in, how deep do you think the water was?
4. While standing at the edge of the mudflat, describe what birds or other creatures (if any) that you can see.
Optionally, add a photo of yourself from the location with the mudflat in the background if you like. That is it! Post the photo with your log but do not post your answers to the questions. Email those to me.
The mudflat created in this location is at the confluence of the Siuslaw River and the North Fork Siuslaw River and an interconnection tidal zone from the Pacific Ocean.
Mudflats are usually found around estuaries and other sheltered coastal areas where wave action is low and sediments are deposited. The sediments consist mostly of silts and clay's with a high organic content. Mudflat sediment deposits are focused into the inter tidal zone which is composed of a barren zone, marsh and salt pan. Within these areas are various ratios of sand and mud that make up the sedimentary layers. The associated growth of coastal sediment deposits can be attributed to rates of subsidence along with rates of deposition (example: silt transported via river) and changes in sea level.
Barren zones extend from the lowest portion of the inter tidal zone to the marsh areas. Beginning in close proximity to the tidal bars, sand dominated layers are prominent and become increasingly muddy throughout the tidal channels. Common bedding types include laminated sand, ripple bedding, and bay mud. Bioturbation also has a strong presence in barren zones.
The waters, mud flats, and tidal wetlands of the Siuslaw River Estuary provide some of the best bird habitat around. In fact, our estuary is designated as one of Oregon's "Important Bird Areas"! According to the Audubon Society, "An Important Bird Area (IBA) is a site that has been selected for its outstanding habitat value and the imperative role it plays in hosting birds, whether for breeding, migrating, or over-wintering.
The Siuslaw river mudflats in this area hold an abundance of Mya Arenaria, the eastern mud clam.
This clam is found living approximately 6–10 in (15–25 cm) under the surface of the mud. It extends its paired siphons up to the surface; these are used to draw in seawater that is filtered for food and expelled. The holes in the mud through which the water is drawn in and out can often be seen at low tide.
There is no need to walk out on the mudflats to log this Earthcache. Although you can at low tide if you wish.