Hard black chunks of material coming out of the dishwasher around the bottom of the door. ???
Hard black chunks of material are coming out of the dishwasher, just below the dishwasher door. ???
Here are your parts
http://www.appliancepartspros.com/partsearch/modelsearch.aspx?model=GSD4330Z00WW
You will have to remove the inner door panel to see what it is etc.
Could be the following has deteriorated.
AP2038430